Mining Machinery PM Sintered Parts
During the sintering process, the powder body undergoes a series of physical and chemical changes, such as the evaporation or volatilization of water or organic matter, the removal of adsorbed gas, the elimination of stress, the reduction of oxides on the surface of powder particles, the migration of substances between particles, recrystallization, Grain growth, etc., thus increasing the crystal contact surface between particles, shrinking or even disappearing pores.
Product Introduction
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Mining machinery PM sintered parts |
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Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
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Mining Machinery Powder Metallurgy |
Carbide |
Powder metallurgy pressing |
1380℃ |
To be customized |
Yes |
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Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
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Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
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Roughness 1～5μm |
(±0.1%～±0.5%) |
7.3-7.6g/CM³ |
According to customer requirements |
0.03g～400g) |
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Sintering process
• Sintering mechanism
During the sintering process, the powder body undergoes a series of physical and chemical changes, such as the evaporation or volatilization of water or organic matter, the removal of adsorbed gas, the elimination of stress, the reduction of oxides on the surface of powder particles, the migration of substances between particles, recrystallization, Grain growth, etc., thus increasing the crystal contact surface between particles, shrinking or even disappearing pores. When the liquid phase appears, the dissolution and precipitation of the solid phase will also occur. These processes have no clear boundaries between each other but overlap and influence each other. Coupled with other sintering process conditions, the reaction of the entire sintering process is complicated. In 1942, G.F.Hüttig of Germany used physical and chemical research methods to measure the influence of sintering temperature on the electromotive force, solubility, density, microstructure, and mechanical properties of sintered bodies and found that sintering is a very complicated process. In 1949, G.C. Kuczynski of the United States studied the sintering of metal balls and metal plates and believed that the material migration during sintering was mainly in the form of diffusion (see Diffusion in metals). Their work pushed the study of sintering theory to a new stage. Much of the later research work revolved around the mechanism of material migration during sintering.
Material migration during sintering is generally considered to have the following five mechanisms: viscous or plastic flow, evaporation and condensation, volume diffusion, grain boundary diffusion, and surface diffusion. When two spherical particles in contact with each other are sintered, the growth of the contact neck radius x and the sintering time t may have the following relationship:
• Sintering process
Sintering must be carried out in a sintering furnace with a protective atmosphere to avoid oxidation of the sintered body or adverse chemical reactions. There are many types of sintering furnaces, and natural gas, coal gas, oil, electricity, etc. can be used as heat sources. The electric heating furnace is economical and convenient, easy to adjust and control. Commonly used protective atmospheres include vacuum, inert gases such as argon, helium, nitrogen, and carbon dioxide, and reducing gases such as hydrogen, decomposed ammonia, carbon monoxide, and converted natural gas.
In order to further improve the performance and size and shape accuracy of Mining machinery PM sintered parts, follow-up processes such as shaping, finishing, repressing, oil immersion, machining, and heat treatment are often carried out.
Metal Injection Molding Process
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