摘要
研究了PcBN黏结剂中TiN与Al的体积分数比值[V(TiN)∶(V Al)]变化对PcBN的烧结行为及相关性能的影响,以期得到较佳的[V(TiN)∶(V Al)]配制比例方案。选择cBN(1～4μm)、TiN(2μm)及Al(1～2μm)粉末进行配混料,在1×10-3Pa、850℃真空炉内处理3 h后,高温高压下合成PcBN聚晶烧结体。通过对PcBN聚晶烧结体物相、硬度、密度及微观形貌的分析,发现硬度与实测密度均随TiN:Al体积分数比值的减小而降低,而相对密度受新物相的生成及烧结致密度等影响。当V(TiN)∶V(Al)为1∶1～1∶2时,烧结体微观形貌均匀一致,相对密度较大,切削后刀面磨损量较小。
The performances of PcBN sintered compact versus different volume fraction of TiN and A1 are analyzed in order to get a better proportion of V（ TiN ） ： V（ A1 ） in making PcBN compact, cBN （ size 1 - 4 μm, purity 99.9%）, TiN（size2 ptm ,purity 〉99%）and A1 （size 1 -2μm, purity 〉99.8%） were taken as starting materials, which were then thermal treated under 1 × 10-3pa and 850 ℃ for 3 h, and sintered in a HPHT cubic apparatus. Based on the test results of phase composition, hardness , density and microstructure analysis, it was found that the hardness and density of PcBN were reduced with the decrease of V （TiN） ： V （A1）, while their relative density were affected by the new phases generated and the compactness after sintering. Experimental results showed that when V （ TiN ） ： V （A1） was 1 ： 1 - 1 ： 2, the samples had a homogeneous microstructure, higher relative density and a smaller flank wear after cutting for a certain distance. It is supposed that the optimal ratio of TiN ： Al is 1 ： 1 - 1 ： 2 for the preparation of PcBN sintered compact.
出处
《金刚石与磨料磨具工程》
CAS
2012年第1期60-63,共4页
Diamond & Abrasives Engineering
基金
2010年郑州市重大科技专项(郑州市科技局财政局)
2009年河南省外经贸发展协调促进资金项目(郑州市商务局财政局)
