1, which has been finely divided tungsten carbide powder and cobalt powder according to the desired shape of the pressure, the metal particles are connected to each other, because only the first step, so the combination is not very strong.
2, the powder particles of the already formed block with increasing temperature, gradually strengthening the degree of the connection, in conjunction 700-800 ℃ when the particles still fragile, more voids between the particles, the voids called pores.
3, the heating temperature is increased to 900 ~ 1000 ℃, the voids between the particles decrease, linearly black part almost disappeared, leaving only the black portion chunks.
4, the temperature was slowly approaching 1100 ~ 1300 ℃ (i.e., normal sintering temperature), to further reduce the gap, binding between the particles become more robust.5, when the sintering process is completed, the tungsten carbide inserts in the form of small particles of polygonal, in which can be seen around the white substance, that is cobalt. Blade organization based sintered cobalt finished basement, covered with tungsten carbide particles. Particle size, shape and the cobalt layer thickness is different, the nature of the cemented carbide inserts are also different.
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