蓝宝石晶体的热学性能研究

Study on Thermal Properties of Sapphire Crystal

对热交换法生长的蓝宝石晶体的热学性质做了系统的研究。在298~1773 K的温度范围内,用热膨胀仪测量晶体的主热膨胀系数分别为α11=5.312×10-6~8.379×10-6K-1,α33=6.008×10-6~9.317×10-6K-1,r向热膨胀系数αr=5.402×10-6K-1~8.821×10-6K-1。在298~1273 K的温度范围内,测得晶体的比热为0.7798~1.2242 J/（g·K）。采用激光脉冲法测量了在298~1273 K温度范围内晶体的热扩散系数,并通过计算得出主热导率分别为k11=31.429~5.556 W/（m·K）和k33=33.611~7.651 W/（m·K）,r向热导率kr=36.521~9.153 W/（m·K）。

The thermal properties of sapphire crystal grown by heat-exchange method were systematically analyzed. The principal thermal expansion coefficients were measured to be oql =5.312 × 106-8.379 × 10^6 K4 and α33：6. 008× 10^6-9. 317× 10^6 K4. The thermal expansion coefficient along r direction was measured to be αr =5.402 × 10^6-8.821× 104 K4 ,over the temperature range of 298-1773 K with a thermal dilatometer,the experimental specific heat was from 0. 7798 to 1. 2242 J/（ g · K）. The thermal diffusivity of the crystal was measured over the temperature range of 298-1273 K through the laser flash method, and the principal thermal conductivity were calculated to be kH = 31. 429-5. 556 W/（ m· K） and k33 = 33.611-7.651 W/（ m · K）, r direction thermal conductivity was calculated to be kr = 36.521-9. 153 W/（ m · K）.