Microwave heating properties of tailorable wave-transparent cementitious materials

doi:10.11949/j.issn.0438-1157.20170118

Abstract

Abstract:

The microwave absorbing ability, compressive strength, volume shrinkage and mass loss rate of hardened calcium aluminate (CA) material at different calcination temperatures (700, 800, 900, 1000, 1100, 1200, 1300, 1400 and 1500℃) were studied. The specimens obtained at different calcination temperatures (800, 1000, 1300 and 1500℃) were characterized using XRF and XRD methods. A simple cup-shaped vessel was prepared by using CA and the microwave shock characteristics of this device were tested. The experimental results showed that the microwave absorbing ability of hardened CA decreased first and then tended to be stable with the increase of calcination temperature. After 1000℃, the microwave absorbing ability was so weak that it is no longer affected by temperature. The compressive strength of this material increased with the rise of calcination temperature, and reached the maximum at around 800℃. Then it gradually decreased and reached the minimum at 1300℃, and then stabilized after a slight increase. In the meantime, the volume shrinkage and mass loss rate increased with the rise of calcination temperature. The test results of microwave shock characteristics showed that the intensity of hardened CA basically did not change under the high-power and long-time microwave irradiation. The microwave-metal discharge test proved that this cementitious material after hardening has excellent mechanical properties and high temperature stability. In summary, hardened CA has good wave-transparent properties, excellent mechanical properties and outstanding high temperature stability, being very suitable for using in microwave heating.

Key words: calcium aluminate, cementitious materials, microwave heating, mechanical properties, wave-transparent properties, stability

摘要：

研究了硬化铝酸钙材料在不同煅烧温度（700，800，900，1000，1100，1200，1300，1400和1500℃）下的吸波能力、抗压强度、体积收缩率和质量损失率，采用XRF和XRD对不同煅烧温度（800，1000，1300和1500℃）下的试样进行表征，利用铝酸钙材料制备一种简易杯状容器并对其进行微波冲击特性测试。结果表明：硬化铝酸钙材料的吸波能力随煅烧温度的升高而降低，超过1000℃后，吸波能力趋于稳定；材料抗压强度随煅烧温度的升高先升高，在800℃左右达到最高，然后逐渐降低，并在1300℃达到最低，再经过小幅地升高后趋于稳定；同时，材料煅烧后体积收缩率和质量损失率都随着温度的升高而增加；微波冲击特性测试表明硬化铝酸钙材料在长时间微波辐照下强度基本不发生变化，微波-金属放电试验证明该胶凝材料硬化后的高温稳定性好，具有优异的抗高温冲击能力。综上所述，1000℃煅烧后的硬化铝酸钙材料具有透波性能好、力学性能优异、高温稳定性好的特点，非常适用于微波加热领域。

关键词: 铝酸钙, 胶凝材料, 微波加热, 力学性能, 透波性能, 稳定性

CLC Number:

TB302

WANG Yican, WANG Wenlong, SUN Jing, MAO Yanpeng, ZHAO Xiqiang, SONG Zhanlong. Microwave heating properties of tailorable wave-transparent cementitious materials[J]. CIESC Journal, 2017, 68(7): 2931-2937.

王宜灿, 王文龙, 孙静, 毛岩鹏, 赵希强, 宋占龙. 可随机成型的透波性胶凝材料的微波加热特性[J]. 化工学报, 2017, 68(7): 2931-2937.

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