以氢氧化铝、氧化镧和氧化镁为原料,采用二步固相高温烧结法合成了镁基六铝酸镧(LaMgAl_(11)O_(19))热障涂层材料,分别利用X射线衍射、扫描电子显微镜、差示扫描量热法、差示热膨胀法和激光脉冲法对材料的物相组成、微观结构、热容、热膨胀系数、热扩散系数和导热系数进行了表征.结果表明,LaMgAl_(11)O_(19)以六方相为主晶相,呈板状结构,在RT～1200℃温度范围内,随着温度的升高,材料的热容逐渐增大,热扩散系数和热导率降低,材料的导热系数优于目前普遍使用的6%～8%氧化钇部分稳定的氧化锆.
The LaMgAl_(11)O_(19) ceramic was prepared by a two-step solid sintering method using aluminum hydroxide and lanthanum oxide and magnesium oxide as raw materials. The phase composition,microstructure,specific heat capacity,thermal expansion coefficient,thermal diffusivity,thermal expansion coefficient and thermal conductivity of the ceramic were investigated using X-ray diffractometer (XRD),scanning electron microscope(SEM),differential scanning calorimeter,dilatometry and laser flash method,respectively. The results showed that the main phase of the ceramic is hexagonal symmetry with plate-type structure over the range of RT～1200℃. As the temperature increases,the specific heat capacity of the ceramic is increased,the thermal diffusivity and thermal conductivity is decreased. The thermal conductivity of the material is superior to 6～8mol% yttria-partially-stabilized zirconia.
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