I - The cemented carbide products sintering mechanism

An overview: the so-called sintering, the powder is heated to a certain temperature, and maintain a certain amount of time, and then cooling, to get the required materials or products, this special heat treatment method called sintering.

Carbide sintered belongs to the liquid phase sintering of multicomponent system, sintering on alloy products play a decisive role.

1, the sintering process of the change of the sintered body: smaller pressure fast volume shrinkage, and strength increase, alloy surface is metal luster, usually, pressure fast porosity is 50%, the products should be less than 0.2%. Sintering process, the qualitative changes between powder particles, the combination of alloy intergranular instead of the contact between the powder particles to form alloy strong overall, which has excellent physical properties.

1, the sintering process of several stages:

(1) removal agent and presintering stage (800 ℃) or less:

The early stage of sintering, with the temperature increases, cracking, gradually forming agent out of the sintered body side by side, at the same time, forming agent increased carbon sintered body more or less. When hydrogen sintering, under 800 ℃ can restore oxide on the surface of the powder, at the same time, the contact stress between powder gradually eliminate, bonding metal powder to produce responses and recrystallization, particle surface diffusion, increase strength.

(2) solid phase sintering stage eutectic temperature (800 ℃ -- 800 ℃) : eutectic temperature refers to the gradual thawing to started to the temperature of the eutectic liquid phase sintered body.

(3) the liquid phase sintering stage (eutectic temperature sintering temperature) : when there is liquid phase sintered body after sintered body contraction finished quickly, carbide grain growth and formation of the skeleton, which laid the basic organization structure of alloy.

(4) cooling stage (sintering temperature - room temperature), the organization of the alloy and binding phase composition varies with the different cooling condition and produce some. After cooling, to get final alloy.

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