Abstract

To prepare 0.5LaPO₄–0.5ZrO₂ and 0.5LaPO₄–0.5Y₂O₃ ceramic composites, a microwave assisted sol-gel procedure for the synthesis of nanosized 0.5LaPO₄·nH₂O–0.5ZrO(OH)₂ and 0.5LaPO₄· nH₂O–0.5Y(OH)₃ precursor powders was developed. Ceramic composites were prepared by microwave sintering of powders at 1100°C after preliminary heat treatment of precursor powders at 850°C, as well as by conventional stepwise sintering at 1000, 1100 and 1200°C for 24 h. The unit cell parameters of monoclinic LaPO₄ were calculated depending on sintering method and temperature. The values of specific surface area of the samples, Vickers microhardness, and thermal conductivity were determined; fracture surface of ceramic samples was studied. Such a complex study of 0.5LaPO₄–0.5ZrO₂ and 0.5LaPO₄–0.5Y₂O₃ composites is presented for the first time. The influence of sintering method, temperature and addition of zirconia and yttria to LaPO₄ on the resulting composite’s properties, phase composition and type of ceramic fracture surface is discussed.

中文翻译：

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微波烧结制备陶瓷复合材料

摘要

为了制备0.5LaPO ₄ –0.5ZrO ₂和0.5LaPO ₄ –0.5Y ₂ O ₃陶瓷复合材料，采用微波辅助溶胶-凝胶法合成纳米尺寸0.5LaPO ₄ · n H ₂ O–0.5ZrO(OH) ₂和研制了0.5LaPO ₄ · n H ₂ O–0.5Y(OH) _{3前驱体粉末。}将前驱体粉末在850℃下初步热处理后，通过在1100℃下微波烧结粉末，以及在1000、1100和1200℃下常规逐步烧结24小时来制备陶瓷复合材料。根据烧结方法和温度计算了单斜LaPO ₄的晶胞参数。测定样品的比表面积、维氏显微硬度、热导率值；研究了陶瓷样品的断裂面。首次对0.5LaPO ₄ –0.5ZrO ₂和0.5LaPO ₄ –0.5Y ₂ O ₃复合材料进行如此复杂的研究。_{讨论了烧结方法、温度以及LaPO 4}中氧化锆和氧化钇的添加量对所得复合材料性能、相组成和陶瓷断裂面类型的影响。