With the advancement of modern technology, the output value of the powder metallurgy industry in the country is increasing at a very high rate every year, especially in the automotive industry, machinery manufacturing, metal industry, aerospace, instrumentation, hardware tools, engineering machinery, electronic appliances and high Technology industry. The use of powder metallurgy technology not only guarantees the strength and hardness of these manufactured mechanical parts, but also has a certain degree of wear resistance and guarantees the service life of the product. As it can be seen, the requirements for wear resistance in powder metallurgy are still relatively high. So do you know what factors are related to the wear resistance of powder metallurgy?
The wear resistance of powder metallurgy is related to the following factors:
1. Chemical elements:
The amount of chemical elements in powder metallurgy affects the increase or decrease of wear resistance. Elements that can not only strengthen the matrix but also generate hard compounds, can improve the wear resistance of iron-based powder metallurgy parts; adding S, Sn, Mn, Mo, Cu, P, RE, etc. can improve the wear resistance of the material.
2. Alloying elements:
The MM200 wear tester is used to test the ability of the material to resist adhesive wear. Under such abrasion conditions, the wear resistance completely depends on the nature of the material itself, and the addition of an appropriate amount of alloying elements has a great influence on the wear resistance. After the iron-based material is sintered, the structure of ferrite and pearlite is generally obtained. , Ferrite is soft and has poor wear resistance, while pearlite has good wear resistance, carbon content increases, pearlite increases, and wear resistance increases.
3. The relationship between wear resistance and hardness:
Hardness and wear resistance have no certain rules in the process of adhesive wear, which may be because the matrix strengthening plays a dominant role in the wear resistance. Anything that can increase the strength and hardness of the matrix or both at the same time will increase the wear resistance of the material. But the wear resistance of powder metallurgy sintered iron-based materials is not only related to the material itself.
4. Process performance and economy:
When selecting materials, in addition to the wear resistance, the processing technology and economy should also be considered in order to obtain a good cost performance. Fe-C-Mn material has poor manufacturability. Although it has good wear resistance, it is difficult to process parts. The process should be strictly implemented during use.