(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱150001)
摘 要: 借助SEM和差熱分析研究Ti-ZrO2(CaO)和TiAl-ZrO2(CaO)體系在不同加熱速率時(shí)的界面顯微組織和反應(yīng)溫度，并利用Kissinger方程對反應(yīng)動(dòng)力學(xué)參數(shù)進(jìn)行計(jì)算。結(jié)果表明：隨著加熱速率的提高，Ti-ZrO2(CaO)和TiAl-ZrO2(CaO)體系的化學(xué)反應(yīng)逐漸減弱，初始反應(yīng)溫度逐漸升高；Al元素的加入使Ti和ZrO2(CaO)的初始反應(yīng)溫度提高近170 ℃，從而弱化Ti與ZrO2(CaO)的界面反應(yīng)；Ti-ZrO2(CaO)體系和TiAl-ZrO2(CaO)體系反應(yīng)活化能分別為1 348 kJ/mol和1 675 kJ/mol，反應(yīng)級數(shù)分別為1.51和1.59。
關(guān)鍵字: 氧化鋯；差熱分析；反應(yīng)；顯微組織
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The microstructures and the reaction temperatures of Ti-ZrO2(CaO stabilized) and TiAl-ZrO2(CaO stabilized) systems were researched at different heating rates by SEM and differential thermal analysis(DTA), and the reaction kinetics parameters in the two systems were calculated by means of Kissinger equation. The results show that, with the increase of heating rates, the chemical reactions of the two systems are weakened gradually, and the initial reaction temperatures increase. Compared to Ti-ZrO2(CaO stabilized) system, the initial reaction temperature in the TiAl-ZrO2(CaO stabilized) system increases about 170 ℃ and the interfacial reaction between Ti and ZrO2(CaO stabilized) is weakened. The activation energies of the two systems are 1 348 kJ/mol and 1 675 kJ/mol, and the reaction orders are 1.51 and 1.59, respectively.
Key words: zirconia; differential thermal analysis; reaction; microstructure
