(上海交通大學(xué) 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室, 上海 200030)
摘 要: 研究了TiB/Ti基復(fù)合材料在550， 600和650 ℃空氣中的恒溫氧化行為， 分析了增強(qiáng)體TiB對(duì)鈦基復(fù)合材料氧化動(dòng)力學(xué)行為的影響， 并用X射線衍射儀和配有能譜儀的掃描電子顯微鏡對(duì)氧化層表面的相組成、 形貌以及氧化層剖面的顯微結(jié)構(gòu)進(jìn)行了分析。 結(jié)果表明： 該復(fù)合材料的氧化動(dòng)力學(xué)曲線主要為拋物線類型； TiB/Ti基復(fù)合材料的氧化層由金紅石型的氧化物TiO2組成， 沒有發(fā)現(xiàn)B2O3的氧化物； 增強(qiáng)體TiB能夠提高鈦基復(fù)合材料的抗氧化性， 而且隨著TiB增強(qiáng)體含量的增加， 鈦基復(fù)合材料的抗氧化性增加； 這主要是因?yàn)門iB增強(qiáng)體促進(jìn)了致密氧化膜的生成。
關(guān)鍵字: 原位合成； TiB/Ti基復(fù)合材料； 氧化； 氧化動(dòng)力學(xué)
（ State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China）
Abstract: The isothermal oxidation behavior of TiB/Ti matrix composites (TMCs) at 550, 600 and 650 ℃ in air was investigated. The reaction products of the oxidation scale were examined by XRD. The surface morphology and cross-sectional microstructure of the oxidation scale were analyzed by SEM. The isothermal oxidation kinetic curves mainly follow parabolic rate law. An oxidation scale mainly consists of rutile-TiO2. No other oxides are observed within the oxide scale. The addition of TiB can improve the oxidation resistance of TMCs. Moreover, the content increase of TiB reinforcements can decrease the overall oxidation rate of TMCs at 550, 600, and 650 ℃. It is attributed to the formation of thin and dense oxidation film.
Key words: in-situ synthesized; TiB/Ti matrix composite; oxidation; oxidation kinetics
