High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第2期
论文作者：高建成 WANG Dangqiang LEI Liwen 张帆 ZHANG Jinyong FU Zhengyi
文章页码：356 - 362
摘 要：A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride （B4C-TiB2） powder mixture.Nearly fully dense （98.6%） materials were obtained at 1700℃ under a pressure of 100MPa.Compared to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 MPa.Analysis of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was applied.Furthermore,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.
高建成，WANG Dangqiang，LEI Liwen，张帆，ZHANG Jinyong，FU Zhengyi
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
摘 要：A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride （B4C-TiB2） powder mixture.Nearly fully dense （98.6%） materials were obtained at 1700℃ under a pressure of 100MPa.Compared to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 MPa.Analysis of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was applied.Furthermore,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.
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