Spark plasma sintering of Al2O3-cBN composites facilitated by Ni nanoparticle precipitation on cBN powder by rotary chemical vapor deposition

作者：Zhang Jianfeng; Tu Rong; Goto Takashi^*

来源：Journal of the European Ceramic Society, 2011, 31(12): 2083-2087.

DOI：10.1016/j.jeurceramsoc.2011.05.019

• Ni nanoparticle precipitated cBN (cBN/Ni)
• Spark plasma sintering (SPS)
• Phase transformation
• Microstructure
• C. Mechanical properties

Al2O3-cBN/Ni composites were consolidated by spark plasma sintering (SPS) using alpha-Al2O3 and Ni nanoparticle precipitated cBN (cBN/Ni) powders. The Ni nanoparticles, 10-100 nm in diameter and 0.5-2.2 mass% in content, were precipitated on cBN powder by rotary chemical vapor deposition. The effect of sintering temperature (T-SPS) and Ni content (C-Ni) on the densification, phase transformation, microstructure and hardness of the Al2O3-cBN/Ni composites were investigated. The highest relative density of Al2O3-30 vol% cBN composite was 99% at T-SPS = 1573 K and C-Ni = 1.7 mass%. At T-SPS = 1673 K, the relative density decreased due to the phase transformation of cBN to hBN. The Vickers hardness of Al2O3-30 vol% cBN/Ni at T-SPS = 1573 K and C-Ni = 1.7 mass% showed the highest value of 27 GPa.

• 出版日期2011-10-15