新型纳米结构WC/Co/NiCrSiB-alloy硬质合金的低温无压快速烧结
Low temperature pressureless immediate sintering of novel nanostructured WC/Co/NiCrSiB-alloy cemented carbide
摘要：
介绍了一种新型纳米结构硬质合金WC-5%Co-20%BNi 2钎料。在烧结过程中，将BNi 2合金在1050-1100 °C下渗透到WC-5%Co的生坯中2-60分钟。仅在40 s后就实现了完美的润湿行为和零接触角。在2分钟和30分钟后分别获得98.5%和100%的相对密度和高于1500 HV 1和1800 HV 1的显微硬度值。前体中约600 nm的平均粒径变化为350-400 nm和10-20 nm的双峰分布，这可以通过溶解/再沉淀机制来解释。
英文摘要：
A novel nanostructured cemented carbide formed from WC-5%Co-20%BNi2 brazing alloy is described. During sintering, the BNi2 alloy is infiltrated into a green compact of WC-5%Co at 1050-1100 °C for 2-60 minutes. Perfect wetting behavior and a zero contact angle are achieved after only 40 s. Relative densities of 98.5% and 100% and microhardness values of above 1500HV1 and 1800HV1 are obtained after 2 and 30 minutes, respectively. A change in mean particle size of about 600 nm in the precursor to a bimodal distribution of 350-400 nm and 10-20 nm is explained by a solution/reprecipitation mechanism.
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