Spark plasma sintering of cBN(core)/SiO2(shell) powder prepared by rotary chemical vapor deposition
Spark plasma sintering of cBN(core)/SiO2(shell) powder prepared by rotary chemical vapor deposition
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DOI：
10.1016/j.jascer.2014.04.001
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发表时间：
2014-09
影响因子：
2.3
通讯作者：
Jianfeng Zhang;H. Katsui;Z. He;T. Goto
中科院分区：
文献类型：
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作者：
Jianfeng Zhang;H. Katsui;Z. He;T. Goto
采用旋转化学气相沉积法制备了SiO2纳米层包覆立方氮化硼（cBN），即cBN（核）/SiO2（壳）粉体。采用放电等离子烧结技术，在1873 K烧结0.3 ks，对cBN/SiO2粉体进行了致密化处理。在cBN-SiO2复合材料中没有观察到六方氮化硼（hBN）相，表明SiO2纳米层抑制了cBN向hBN的相变。随着SiO2含量的增加，cBN-SiO2的相对密度增加（）。cBN-SiO2复合材料在0.98 N载荷下的最高硬度为17.5 GPa。
SiO2nanolayer coated cubic boron nitride (cBN), cBN(core)/SiO2(shell) powder, was prepared by rotary chemical vapor deposition. The cBN/SiO2powder was densified by spark plasma sintering at 1873 K for 0.3 ks. The hexagonal boron nitride (hBN) phase was not observed in the cBN–SiO2composites, indicating that the SiO2nanolayer depressed the phase transformation from cBN to hBN. The relative density of cBN–SiO2increased with increasing SiO2content (). The highest hardness of the cBN–SiO2composite was 17.5 GPa atand a load of 0.98 N.