Tungsten Steel Production Process

Tungsten Steel Sintering Process

1: Removal of forming agents burn stage, at this stage of the sintered body changes as follows: removal of forming agent, as the initial stage of sintering temperature, forming agent gradual decomposition or vaporization, excluded from the sintered body, at the same time , more or less to the sintered body forming agent by carbon, increasing the amount of carbon forming agent with the type, quantity and sintering process vary. The powder surface oxides are reduced, at the sintering temperature, the hydrogen can be reduced cobalt and tungsten oxides, if the vacuum-forming agent removal and sintering, the oxygen reaction is not strong. Contact stress between the powder particles gradual elimination, bonding metal powder begins to generate recovery and recrystallization, surface diffusion began, briquette strength increased.

2: solid-phase sintering stage (800 ℃ - eutectic temperature) appears before the temperature of the liquid phase, in addition to carry out the last stage of the process that occurs, the solid phase reaction and diffusion increase, reinforced plastic flow of the sintered body appear significant contraction.

3: The liquid phase sintering stage (eutectic temperature - sintering temperature) occurs when the liquid phase sintered body after contraction completed soon, and then produce crystalline transition, the formation of the basic organization and structure of the alloy.

4: cooling stage (sintering temperature - room temperature), at this stage, tungsten steel with the organization and phase composition of the different cooling conditions have some changes that can take advantage of this feature, tungsten steel, heat treated to improve its physical and mechanical performance.


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