Preparation and Characterization of Polycrystalline Cubic Boron Nitride (PcBN) Compacts by a Pressureless Sintering Process

Zhen Huo Ren; Rui Zhang; Hai Long Wang; De Liang Chen; Ming Liang Li

doi:10.4028/www.scientific.net/AMR.105-106.38

Paper Titles

Properties and Structure of Micro Porous Mullite-Corundum Refractory with High Strength
p.23

Effects of Sintering Additives on the Microstructure and Mechanical Properties of Silicon Nitride Ceramics by GPS
p.27

Fabrication of SiC/Ti₃SiC₂/TiC Ceramic Composites by Pressureless Sintering of 3TiC/2.2Si/0.2Al
p.31

A Fracture Dynamics Model for Fiber Reinforced Ceramics
p.34

Preparation and Characterization of Polycrystalline Cubic Boron Nitride (PcBN) Compacts by a Pressureless Sintering Process
p.38

Effect of Sm₂O₃ Additives on the Rod-Like β-Si₃N₄ Crystal of Porous Silicon Nitride Fabricated by Reaction-Bonded
p.42

Morphology of In Situ VC Ceramics in High Speed Steel with High Vanadium Content
p.46

Surface Microhardness and Flexural Strength of Colored Zirconia
p.49

Preparation of Ti(C,N)-Based Cermets
p.51

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 105-106Preparation and Characterization of...

Preparation and Characterization of Polycrystalline Cubic Boron Nitride (PcBN) Compacts by a Pressureless Sintering Process

Abstract:

A novel cost-effective pressureless sintering method has been developed to prepare polycrystalline cubic boron nitride (PcBN) compacts. The effect of feldspar as sintering aids was analyzed in this paper. Various amounts of feldspar from 5 to 15 wt% were added to cBN powders, and the pressureless sintering was conducted at temperatures ranging from 900°C to 1200°C under an air atmosphere. The microstructure, phase, density and microhardness of the as-obtained PcBN compacts were measured and correlated to amounts of Si added and to sintering temperatures. The sample showed superior sintering behavior in comparison to those fabricated using hot pressed sintering. The results of X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that feldspar diffused homogeneously and tightly bonded with cBN. But hBN appeared when the sintering temperature even at 900°C, which dramatically affected the property of PcBN compacts. A PcBN compact with a relative density of 91% was obtained at 1100°C and its microhardness was as high as 1000HV.