As the the improvement of economy and living standards, the car has got popularity in the family, under the premise that the momentum of the development of the car industry is becoming higher and higher. Car now, because of the advocate energy conservation and environmental protection are required to reduce fuel and emission quantity, one of the most key initiatives is to reduce car weight.
And to do this, powder metallurgy technology has irreplaceable role. Data show that with the applied powder metallurgy in the car, on average every car has 5 kg of powder metallurgy parts, like on the engine, valve seat, etc. Engine temperature have been reduced after using powder metallurgy parts. While valve seat made of powder metallurgy, on the premise of temperature reducing the thermal conductivity is improved a lot.
There is a commonly used titanium alloy powder metallurgy on the car, using it can reduce the weight of the car, increase the service life of the car, at the same time can achieve the accuracy requirement.
Monday, June 26, 2017
Monday, June 5, 2017
Thermoelectric materials made by Powder metallurgy
Powder metallurgy method making thermoelectric materials bismuth telluride (Bi2Te3) alloy, working temperature isclose to 450 ℃ can be used in the manufacture of household refrigerator, air conditioner, small detectors and sensors, etc. Bismuth telluride with a small amount of antimony telluride (Sb2Te3) alloying can form P type semiconductor solid solution, and with a small amount of bismuth selenide (Bi2Se3) alloying can form N type semiconductor solid solution. Bismuth telluride, it and other components to forming alloy have highly anisotropic structure. the most commonly used method making bismuth telluride alloy is single crystal directional crystallization. But this method is low productivity, segregation, and poor mechanical properties.
Canada after three years development, has developed a method of of producing bismuth telluride alloy by powder
metallurgy. It is mechanical alloying 2-5 mm diameter granular pure elements (such as Bi, TeSeSb) powder in a ball mill, after about 3h can be obtained for 5~10 m particle size alloy powders. Powder is cold pressed under the pressure of 360 mpa , compact body relative density of 80%, And hot extrusion in inert atmosphere into the 963.5 mm bar, extrusion temperature 420-490 ℃. The extrusion speed of 2 mm/min, products is dense after hot extrusion. Although extrusion materials is polycrystalline, but have no difference thermoelectric performance with single crystal material.
Material compression strength is 105 mpa, and the single crystal materials is only 20 mpa, grain boundaries hinder crack propagation of polycrystalline materials. This is helpful to improve its mechanical properties and the reliability of the thermoelectric devices. Manufacturing thermoelectric materials of powder metallurgy method can reduce the production cost, increase productivity, and has no damage.
Canada after three years development, has developed a method of of producing bismuth telluride alloy by powder
metallurgy. It is mechanical alloying 2-5 mm diameter granular pure elements (such as Bi, TeSeSb) powder in a ball mill, after about 3h can be obtained for 5~10 m particle size alloy powders. Powder is cold pressed under the pressure of 360 mpa , compact body relative density of 80%, And hot extrusion in inert atmosphere into the 963.5 mm bar, extrusion temperature 420-490 ℃. The extrusion speed of 2 mm/min, products is dense after hot extrusion. Although extrusion materials is polycrystalline, but have no difference thermoelectric performance with single crystal material.
Material compression strength is 105 mpa, and the single crystal materials is only 20 mpa, grain boundaries hinder crack propagation of polycrystalline materials. This is helpful to improve its mechanical properties and the reliability of the thermoelectric devices. Manufacturing thermoelectric materials of powder metallurgy method can reduce the production cost, increase productivity, and has no damage.
Wednesday, May 17, 2017
Rare earth permanent magnetic material application in military field
Rare earth elements have excellent magnetic properties, it comes from the unique electronic structure of the rare earth.The 4f electronic shell has more unpaired electrons, such as trivalent gadolinium ion unpaired electrons reached 7, canproduce large magnetic moment. In addition because lanthanide 4f electronic shell with 5s, 5p, metallic state also has 6s shell, this makes 4f electronic shell is less influenced by external crystal field. This nature is not only reflected in its narrow spectral lines, good monochromaticity, and can reflect on their magnetic properties. 4f electronic shell orbital magnetic moment will not be "frozen", atomic magnetic moment to show the orbital magnetic moment and the sum of the spin magnetic moment, its value is bigger. Rare earth elements has more excellent magnetic properties. It can be used for the preparation of magnetic materials with various kinds of performance. Mainly including rare earth permanent magnet material, magnetic refrigeration materials, magnetostrictive materials.
Development of rare earth permanent magnet materials has experienced three generations:
The first generation of SmCo5 permanent magnetic material, the second generation of Sm2Co17 permanent magnetic material, the third generation of ndfeb permanent magnet material (Nb-Fe-B). So to speak, rare earth permanent magnet application in military field are everywhere. In regular communication, one end convert the voice signal into electrical signal, the other end convert electrical signal into sound signal, both need the aid of electromagnet, the motor converts electrical energy into kinetic energy, generator transforms mechanical energy into electricity needs assistance of the magnet. In the guidance of cruise missile, the effect of permanent magnet is very important. Such as the Gulf War showing great power missile "the patriot" used 4kg of ndfeb permanent magnet materials. Domestic long sword, red bird, eagle series missile is also dependent on the high performance of rare earth permanent magnet materials.
Development of rare earth permanent magnet materials has experienced three generations:
The first generation of SmCo5 permanent magnetic material, the second generation of Sm2Co17 permanent magnetic material, the third generation of ndfeb permanent magnet material (Nb-Fe-B). So to speak, rare earth permanent magnet application in military field are everywhere. In regular communication, one end convert the voice signal into electrical signal, the other end convert electrical signal into sound signal, both need the aid of electromagnet, the motor converts electrical energy into kinetic energy, generator transforms mechanical energy into electricity needs assistance of the magnet. In the guidance of cruise missile, the effect of permanent magnet is very important. Such as the Gulf War showing great power missile "the patriot" used 4kg of ndfeb permanent magnet materials. Domestic long sword, red bird, eagle series missile is also dependent on the high performance of rare earth permanent magnet materials.
Tuesday, April 18, 2017
The critical factors that influencing the development of MIM
As a new type of processing and forming technology, the development of metal powder injection molding are influenced by several key factors, these factors determine the development prospects of the technology, the development speed and development trend. Study well, these factors can promote the further development of metal powder injection molding, solved bad will be the resistance of development.
Material consists of Metal injection molding technology includes metal powder and binder. In simple terms, metal powder and binder with certain proportion, mixing according to the rules of feed way and order at high temperature and the effect of shear stress to obtain the uniform structure of feeding, and then the granulate. Due to the existence of the binder, granulated materials has good flow property on when injection, and can be fully populated into the mold cavity. After forming, the green body through degreasing process to remove the organic component, and then sintering and densification, the finished product can be obtained.
Since the 1970s to the present just a few decades, metal powder injection molding technology has made great development and progress, but also exposed some deficiencies of the current technical route and process route. These weaknesses objectively prevent the development of the technology to a deeper level. Thus solving these deficiencies is the top priority.
Material consists of Metal injection molding technology includes metal powder and binder. In simple terms, metal powder and binder with certain proportion, mixing according to the rules of feed way and order at high temperature and the effect of shear stress to obtain the uniform structure of feeding, and then the granulate. Due to the existence of the binder, granulated materials has good flow property on when injection, and can be fully populated into the mold cavity. After forming, the green body through degreasing process to remove the organic component, and then sintering and densification, the finished product can be obtained.
Since the 1970s to the present just a few decades, metal powder injection molding technology has made great development and progress, but also exposed some deficiencies of the current technical route and process route. These weaknesses objectively prevent the development of the technology to a deeper level. Thus solving these deficiencies is the top priority.
Monday, March 6, 2017
China domestic powder metallurgy enterprises are expected to compete with international large enterprises
Powder metallurgy technology is a highly efficient, energy-saving new technology, occupies an important position in the economic development. In recent years, powder metallurgy products industry development is rapid, as technology changes and updated constantly, powder metallurgy industry development prospects is becoming vaster.
With the progress of society, the development of every industry achieved by leaps and bounds, while the largest power propel the development of the industry comes from the high-tech support. Powder metallurgy products, for example, although the powder metallurgy industry in the market has great potential for development, the application field is extremely broad. But these factors do not say powder metallurgy products can survive in the competition the worse and worse living environment. In numerous of powder metallurgy products, only with the high-end technology, comprehensive services, can firmly seize the user's eye, become the most popular powder metallurgy products in the market.
Powder metallurgy technology is a highly efficient, energy-saving new technology, occupies an important position in the economic development. In recent years, powder metallurgy products industry development is rapid, as technology changes and updated constantly, powder metallurgy industry development prospects is becoming vaster.
With the progress of society, the development of every industry achieved by leaps and bounds, while the largest power propel the development of the industry comes from the high-tech support. Powder metallurgy products, for example, although the powder metallurgy industry in the market has great potential for development, the application field is extremely broad. But these factors do not say powder metallurgy products can survive in the competition the worse and worse living environment. In numerous of powder metallurgy products, only with the high-end technology, comprehensive services, can firmly seize the user's eye, become the most popular powder metallurgy products in the market.
With the progress of society, the development of every industry achieved by leaps and bounds, while the largest power propel the development of the industry comes from the high-tech support. Powder metallurgy products, for example, although the powder metallurgy industry in the market has great potential for development, the application field is extremely broad. But these factors do not say powder metallurgy products can survive in the competition the worse and worse living environment. In numerous of powder metallurgy products, only with the high-end technology, comprehensive services, can firmly seize the user's eye, become the most popular powder metallurgy products in the market.
Powder metallurgy technology is a highly efficient, energy-saving new technology, occupies an important position in the economic development. In recent years, powder metallurgy products industry development is rapid, as technology changes and updated constantly, powder metallurgy industry development prospects is becoming vaster.
With the progress of society, the development of every industry achieved by leaps and bounds, while the largest power propel the development of the industry comes from the high-tech support. Powder metallurgy products, for example, although the powder metallurgy industry in the market has great potential for development, the application field is extremely broad. But these factors do not say powder metallurgy products can survive in the competition the worse and worse living environment. In numerous of powder metallurgy products, only with the high-end technology, comprehensive services, can firmly seize the user's eye, become the most popular powder metallurgy products in the market.
Saturday, February 11, 2017
NASA invented new metal material automatically repair in two seconds
Remember automatic repair robots in science fiction film? NASA invented a kind of new material, can automatically repair damaged parts in 2 seconds. This material can be used in spacecraft and military aircraft and tank hell automaticrepair.
The Australian news network reported on September 1, although the material is not like science fiction movies the liquid metal robot in the "terminator", intelligent repair and leave no trace, but it can make a spaceship and military aircraft or tank automatically repair the damaged shell. Scientists demonstrated in the experiment, with one or two polyester layer metal after is penetrated, because oxygen entered and mixed with them, polyester liquid rubber containing tributyl borane(tributylborane) produces chemical reaction, quickly harden and finally repair the damaged parts of the metal.
The researchers said: "this liquid rubber turns into solid after it contacts with air." At present, the material needs to be studied further, testing its application features. The material is likely to use to repair damaged holes on the spacecraft, as well as for military equipment, such as plane or tanks.
Besides, according to IFLScience reported on August 27, this self repair material is NASA developed by cooperation with scientists at the university of Michigan. Jim·Scott (Timothy Scott) of The university of Michigan explaned, this kind of material cannot be used as components individually, but need to mix with other materials. Scott said: our purpose is to repair damaged (hole) quickly.
Moreover, the characteristics of the material is, the thinner the faster it will work. In the experiment, the thickness of the materia plate is 1 mm. In the actual product, the material plate will be thinner, the possible thickness is less than one tenth or even one hundredth.
The Australian news network reported on September 1, although the material is not like science fiction movies the liquid metal robot in the "terminator", intelligent repair and leave no trace, but it can make a spaceship and military aircraft or tank automatically repair the damaged shell. Scientists demonstrated in the experiment, with one or two polyester layer metal after is penetrated, because oxygen entered and mixed with them, polyester liquid rubber containing tributyl borane(tributylborane) produces chemical reaction, quickly harden and finally repair the damaged parts of the metal.
The researchers said: "this liquid rubber turns into solid after it contacts with air." At present, the material needs to be studied further, testing its application features. The material is likely to use to repair damaged holes on the spacecraft, as well as for military equipment, such as plane or tanks.
Besides, according to IFLScience reported on August 27, this self repair material is NASA developed by cooperation with scientists at the university of Michigan. Jim·Scott (Timothy Scott) of The university of Michigan explaned, this kind of material cannot be used as components individually, but need to mix with other materials. Scott said: our purpose is to repair damaged (hole) quickly.
Moreover, the characteristics of the material is, the thinner the faster it will work. In the experiment, the thickness of the materia plate is 1 mm. In the actual product, the material plate will be thinner, the possible thickness is less than one tenth or even one hundredth.
Friday, January 13, 2017
MIM parts are highly welcomed in military industry
Metal powder injection molding (MIM) technology can directly forming high precision and complex geometry, small parts, and wide applicable materials. After introduced into China since the 1970's, it has been rapidly developing in all walks of life.
Metal powder injection molding in the earlier application in the ordnance production in China, which mainly includes firearms, artillery shells and other components. Gun parts shape and structure is complex, due to special application environment and has a certain risk, determine the gun parts must have high quality, including mechanical properties, density, precision, etc. Traditional gun parts generally used forging blank as raw material production by machining, the machining can obtain pretty high quality of gun parts. But machining material utilization rate is low, especially in the production of gun structure parts, metal shell, etc., the utilization rate of material only between 15% to 20%, most of the materials are cut. And for small parts of guns (trigger, magazine catch, etc.), high strength material (carbon steel, etc.) production difficulty is big, the efficiency is low and is not economical.
Use a metal injection molding forming can make all kinds of complex shape parts, and overcome the machining
characteristics of low material utilization, can save a lot of metal materials, greatly reduce the processing cost. Because the metal injection molding has a variety of advantages, people began to use the process to produce all kinds of gun parts, for example, the main spring housing, hammer, trigger, magazine catch, inadequate safety, etc. With the development of metal injection molding and mature technology, metal powder injection parts occupies more and more proportion in the gun composition.
At present, the rifle in the ordnance, in addition to the big parts like gun body and gunstock, most of the rest metal parts is made by metal injection molding. In the pistol, charging, trigger and shell also use the injection molding parts. Metal injection molding has wide range of materials application, can produce all kinds of metal materials of gun parts, satisfy people demand of variety of materials on the application of the gun.
In addition, the quality of gun parts produced by MIM have good consistency and high density, and has the characteristics of less machining, most of the parts don't need to be machined and can reach the accuracy of requirement, this makes the metal powder injection parts occupies a considerable proportion in guns.
Metal powder injection molding in the earlier application in the ordnance production in China, which mainly includes firearms, artillery shells and other components. Gun parts shape and structure is complex, due to special application environment and has a certain risk, determine the gun parts must have high quality, including mechanical properties, density, precision, etc. Traditional gun parts generally used forging blank as raw material production by machining, the machining can obtain pretty high quality of gun parts. But machining material utilization rate is low, especially in the production of gun structure parts, metal shell, etc., the utilization rate of material only between 15% to 20%, most of the materials are cut. And for small parts of guns (trigger, magazine catch, etc.), high strength material (carbon steel, etc.) production difficulty is big, the efficiency is low and is not economical.
Use a metal injection molding forming can make all kinds of complex shape parts, and overcome the machining
characteristics of low material utilization, can save a lot of metal materials, greatly reduce the processing cost. Because the metal injection molding has a variety of advantages, people began to use the process to produce all kinds of gun parts, for example, the main spring housing, hammer, trigger, magazine catch, inadequate safety, etc. With the development of metal injection molding and mature technology, metal powder injection parts occupies more and more proportion in the gun composition.
At present, the rifle in the ordnance, in addition to the big parts like gun body and gunstock, most of the rest metal parts is made by metal injection molding. In the pistol, charging, trigger and shell also use the injection molding parts. Metal injection molding has wide range of materials application, can produce all kinds of metal materials of gun parts, satisfy people demand of variety of materials on the application of the gun.
In addition, the quality of gun parts produced by MIM have good consistency and high density, and has the characteristics of less machining, most of the parts don't need to be machined and can reach the accuracy of requirement, this makes the metal powder injection parts occupies a considerable proportion in guns.
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