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What factors will affect the sintering temperature of hard alloys?

Views: 0     Author: Zhuzhou Jinding Cemented Carbide Co., Ltd     Publish Time: 2024-06-27      Origin: Site

The following are some factors that can affect the sintering temperature of hard alloys:

1. Chemical composition

-The types and contents of different elements in alloys can change their physical and chemical properties, thereby affecting the sintering temperature. For example, when the cobalt content is high, the sintering temperature is usually reduced.

2. Powder particle size

-The smaller the powder particles, the greater their surface energy, and the faster the atomic diffusion rate, allowing sintering to be completed at relatively low temperatures. On the contrary, coarser powder particle size may require a higher sintering temperature.

3. Additives

-Some additives such as carbide forming elements (such as titanium, tantalum, niobium, etc.) or inhibitors can change the sintering behavior and temperature of alloys.

4. Compression pressure

-The pressure during compression molding can affect the density and porosity of the green body. Higher pressing pressure usually makes the green billet denser, thereby reducing the sintering temperature.

5. Atmosphere

-The atmosphere during sintering (such as vacuum, hydrogen, inert gases, etc.) can affect chemical reactions and material transfer, thereby affecting the sintering temperature.

6. Heating rate

-A faster heating rate may lead to uneven temperature distribution, affecting the sintering effect, and sometimes it may be necessary to increase the final sintering temperature appropriately to compensate.

7. Insulation time

-Adequate insulation time helps to facilitate sufficient atomic diffusion and homogenization of the organizational structure, but excessive insulation time may lead to adverse effects such as grain growth.

8. Initial density

-The higher the initial density of the green body, the lower the sintering temperature required to achieve complete densification.

9. Requirements for the microstructure of alloys

-If specific grain size, phase distribution, or microstructure are required, this will also have an impact on the sintering temperature.

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