Abstract:

In order to study the pressure transmission properties of composite powder between fine silicon powder and hexagonal boron nitride, this paper made use of mechanical press to apply force to the different mass ratio of composite powder under different temperature. Meanwhile, the inner wall pressure distribution was measured by high temperature resistant pressure sensor. The results prove that when the hexagonal boron nitride comes to 2% of the composite powder, the effects of pressure transmission property are the best. At the same time, it is found that temperature is not an obvious factor to influence the pressure transmission properties, and the properties will be steady with high temperature conditions. With 40Cr steel pipe fittings, the hot state internal high pressure forming experiment was explored where the composite powder was used as pressure transmission medium under 500℃. The experiment produces satisfied internal pressure forming parts.

Key words: fine silicon powder, hexagonal boron nitride, pressure transmission property, internal high pressure forming

摘要：

为了研究硅微粉和六方氮化硼复合粉的传压性能,利用压力机对不同质量分数的复合粉在不同温度下施加压力,并利用耐高温压力传感器测量了筒壁上分布的压力。实验结果证实,加入的六方氮化硼的质量分数在2%时复合粉的传压效果最佳,同时发现温度对复合粉的传压性能影响不显著,高温下传压性能保持稳定。将该复合粉作为传压介质在500℃下进行了40Cr合金钢管件的热态内高压成形试验,获得了满意的内高压成形件。
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关键词: 硅微粉, 六方氮化硼, 传压性能, 内高压成形