材料科学
钻石
复合材料
聚晶金刚石
微观结构
微晶
金刚石材料性能
烧结
粒度
化学气相沉积
表征(材料科学)
冶金
扫描电子显微镜
拉曼光谱
作者
Lucas Pires de Paiva Barreto,Meysam Mashhadikarimi,M.A.L.O. Rodrigues,Diego Pires Gurgel,Uilame Umbelino Gomes,Marcello Filgueira,Regina Bertília Dantas de Medeiros
标识
DOI:10.1016/j.diamond.2020.107867
摘要
This study aimed to obtain and characterize a polycrystalline diamond body (PCD) sintered with 15 wt% Nb
binder, through the high-pressure high-temperature (HPHT) sintering techniques at three different temperatures
of 1650 °C, 1750 °C, and 1850 °C, with a pressure of 7.7 GPa. Characterizations on the starting powders were
performed before and after high energy ball milling, and then the obtained mixture was sintered. The results
showed that niobium could perform as a good binder for the sintering PCD at the specified concentration,
achieving relative densities in the range of 96% to 100% for all three sintering temperatures. Also, analyses of
the electron micrographs and the Raman spectrograms showed that there was no graphitization, a common
problem in this type of material, and there was uniform dispersion of the niobium at the interfaces of the
diamond particles, and no cracking.
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