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Effect of Si_3N_4 Addition on the Mechanical Properties, Microstructures, and Wear Resistance of Ti-6Al-4V Alloy

Journal of Materials Science & Technology 2007年第2期23卷 257-261页

作者： Ruihua HU Montasser M. Dewidar Hyo-Jin KIM Jae-Kyoo LIM Henan University of Science and Technology Luoyang 471003 China Department of Mechanical Design Chonbuk National University Dokjin 1-664-14 Jeonju South Korea Department of Mechanical Design and Materials High Institute of Energy South Valley University Aswan Egypt Automobile High-Technology Research Institute Faculty of Mechanical and Aerospace System Engineering Chonbuk National University Dokjin 1-664-14 Jeonju South Korea

In order to improve the wear resistance of Ti-6Al-4V, different amounts of Si3N4 powder were added into the alloy powder and sintered at 1250℃. Porous titanium alloy with higher wear resistance was successfully fabricated. At sintering temperature, reaction took place and a new hard phase of Ti5Si3 formed. The mechanical properties of the fabricated alloys with different amounts of Si3N4 addition were investigated. The hardness of Ti-6Al-4V, which is the index of wear resistance, was increased by the addition of Si3N4. Amounts of Si3N4 addition have very significant influences on hardness and compressive strength. In present study,titanium alloy with 5 wt pct Si3N4 addition has 62% microhardness and 45% overall bulk hardness increase,respectively. In contrast, it has a 16.4% strength reduction. Wear resistance was evaluated by the weight loss during wear test. A new phase of Ti5Si3 was detected by electron probe microanalyzer （EPMA） and X-ray diffraction （XRD） method. The original Si3N4 decomposed during sintering and transformed into titanium silicide. Porous structure was achieved due to the sintering reaction.

关键词： Ti-6Al-4V Silicon nitride sintering reaction Mechanical properties

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