【摘要】 采用分步固相法合成ZrW₂O₈粉体,并制备出ZrW₂O₈/ZrO₂（Al₂O₃）复合材料。所制备的复合材料呈近零膨胀特性,其热膨胀系数为0.48×10^-6K^-1。Al₂O₃的添加,生成新相Al₂（WO₄）₃,提高了复合材料的致密度,而对其近零膨胀影响不大。ZrW₂O₈/ZrO₂复合材料的导热系数为1.42 W·（m·K）^-1。体积电阻率测试结果表明,在200℃以下,复合材料呈良好的绝缘性能;在200℃以上,复合材料的体积电阻率随着温度的升高而降低。更多还原

【Abstract】 ZrW₂O₈ powders were synthesized via substep solid state reaction.Furthermore,ZrW₂O₈/ZrO₂（Al₂O₃） composites were prepared by sintering.ZrW₂O₈/ZrO₂ composite shows near zero thermal expansion.Its coefficient of thermal expansion is 0.48×l0^-6 K^-1.Al₂（WO₄）₃ was formed by adding Al₂O₃ in ZrW₂O₈/ZrO₂ composite.It improves the density of composite,but has little effect on the near zero thermal expansion of the composites.The coefficient of heat conductivity of ZrW₂O₈/ZrO₂ composite is 1.42 W·（m·K）^-1.The volume resistivity measurement results show that the composites are insulators below 200℃.The volume resistivities of composites show a clear temperature dependence over 200℃.It decreases with increasing of temperature.更多还原