In situ reacted TiB2-reinforced mullite
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In situ formation of TiB2 in mullite matrix through the reaction of TiO2, boron and carbon has been studied. In hot-pressed and pressureless-sintered samples, in addition to TiB2, TiC was also found to be dispersed phases in mullite matrix. However, in the case of pressurelesssintered samples, mullite/TiB2 composite with 98% relative density can be obtained through a preheating step held at 1300 °C for longer than 3 h and then sintering at a temperature above 1600 °C. Hot-pressed composite containing 30 vol% TiB2 gives a flexural strength of 427 MPa and a fracture toughness of 4.3 MPam1/2. Pressureless-sintered composite containing 20 vol% TiB2 gives a flexural strength of 384 MPa and a fracture toughness of 3.87 MPam1/2.
KeywordsPolymer TiO2 Boron Fracture Toughness Relative Density
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