GYSZ-NiCr2O4复相陶瓷材料的高温稳定性及隔热能力研究

Study on High Temperature Stability and Thermal Insulation Ability of GYSZ-NiCr2O4 Composites

摘要:

针对目前热障涂层光子导热较高的问题,设计了Gd掺杂YSZ-NiCr₂O₄复相陶瓷材料(GYSZ-NCO),并对其烧结参数、热稳定性及热导率进行了分析。结果表明,在烧结温度为1600℃时可获得四方相GYSZ材料,且GYSZ-NCO系列材料在1500℃下具有较高的热稳定性,保温300h无相变发生,加入NiCr₂O₄后,GYSZ材料热导率在高温下无明显回升,表现出了优良的抗光子导热能力,GYSZ-5%NCO材料热导率最低,在1200℃时仅为2.23 W/(m.K)。

Abstract:

In view of the high photonic thermal conductivity of thermal barrier coatings, a Gd-doped YSZ-NiCr₂O₄ composite (GYSZ-NCO) was designed, and its sintering parameters, thermal stability and thermal conductivity were analyzed. The results show that tetragonal GYSZ can be obtained when the sintering temperature is 1600 ℃, and the GYSZ-NCO series materials have high thermal stability at 1500 ℃, and no phase transition occurs after holding for 300 h. After adding NiCr₂O₄, the thermal conductivity of GYSZ did not rebound significantly at high temperature, showing excellent thermal conductivity against photons. The thermal conductivity of the GYSZ-5%NCO material has the lowest thermal conductivity, which is only 2.23 W/(m.K) at 1200 °C.