Sintering of alumina by 2.45 GHz microwave heating
Sintering of alumina by 2.45 GHz microwave heating
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DOI：
10.1016/s0955-2219(03)00217-6
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Mizuno;S. Obata;S. Takayama;S. Ito;Nobuhisa Kato;T. Hirai;Motoyasu Sato
中科院分区：
文献类型：
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作者：
M. Mizuno;S. Obata;S. Takayama;S. Ito;Nobuhisa Kato;T. Hirai;Motoyasu Sato
在由莫来石和α-Al 2 O3组成的内层覆盖层和外层纤维状Al 2 O3-SiO2复合板组成的等温阻挡层结构上，研究了2.45 GHz微波加热下Al 2 O3的烧结行为。从具有不同尺寸的样品的密度，即不同体积与表面比，预测样品内的温度差。温差在1500 ℃左右最大。由温差引起的热应力没有在样品中产生微裂纹。在1600°C时，样品中的温差非常小。在1600°C烧结的样品中，通过SEM观察到均匀的显微结构。从在1600 ℃下烧结的样品（烧结前尺寸：60 × 60 × 30 mm）的中心切割试样，测量试样的弯曲强度。
Sintering behavior of alumina by 2.45 GHz microwave heating was investigated on the base of an isothermal barrier structure, which consisted of an inner blanket (composed of mullite and α-alumina) and an outer one (fibrous alumina-silica board). The temperature difference within the sample was predicted from the densities of samples with different sizes, i.e. different volume to surface ratios. The temperature difference was largest at about 1500°C. The thermal stresses caused by the temperature difference did not produce microcracks in the sample. Very little temperature difference in the sample would exist at 1600°C. The homogeneous microstructures were observed by SEM in the sample sintered at 1600°C. Bending strength was measured for test pieces, which were cut from the center of sample (size before sintenng: 60 × 60 × 30 mm) sintered at 1600°C.