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首页> 外文期刊>日本セラミックス協会学術論文誌 >Crystal Phase and Sinterability of Wet-Chemically Derived YAG Powders
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Crystal Phase and Sinterability of Wet-Chemically Derived YAG Powders

机译：化学湿法合成YAG粉末的晶相和烧结性

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摘要

Four wet-chemical methods (normal strike co-precipitation, reverse strike co-precipitation, urea homogeneous precipitation, and a modified Pechini process) were adopted in the present work to synthesize the precursor for a sinterable YAG powder. The X-ray diffraction (XRD) results revealed that the phase development of the precursor during calcination and the formation temperature of pure YAG vary among the four methods. The lowest temperatures for pure YAG formation were determined by the XRD method to be 850 deg C, 950 deg C, 1200 deg C and > 1200 deg C for the modified Pechini method, reverse strike co-precipitation, normal strike co-precipitation and urea homogeneous precipitation, respectively. The differences concerning YAG formation among the four methods were explained from the view point of the chemical homogeneity of the precursor. That is, higher chemical homogeneity resulted in the lower temperature of YAG formation. Except the case of modified Pechini method, the sinterability of the YAG powders increased with a decrease in the above temperatures for pure YAG formation because the YAG powder produced from the precursor with higher chemical homogeneity showed smaller particle size and weaker agglomeration. The YAG powder synthesized by the modified Pechini method showed the poorest sinterability due to its extremely hard aggregates caused by the direct pyrolysis of the mother salts. The most sinterable YAG powder, produced by the reverse strike co-precipitation method, densified up to 91.86percent of its theoretical density after sintering at 1520 deg C with a constant heating rate of 8 deg C /min. While the YAG powder synthesized by the modified Pechini method only densified up to 69.2percent of its theoretical density under the same sintering conditions.
机译：在本工作中，采用了四种湿化学方法（正相共沉淀，逆相共沉淀，尿素均匀沉淀和改良的Pechini工艺）来合成可烧结YAG粉末的前体。 X射线衍射（XRD）结果表明，在四种方法中，煅烧期间前体的相发展和纯YAG的形成温度不同。通过XRD方法确定的纯YAG形成的最低温度分别为850℃，950℃，1200℃和> 1200℃（对于改良的Pechini方法），反向打击共沉淀，正常打击共沉淀和尿素分别均匀沉淀。从前体的化学均一性的角度解释了四种方法中关于YAG形成的差异。即，较高的化学均质性导致较低的YAG形成温度。除了改进的Pechini方法的情况外，YAG粉末的烧结性会随着上述温度的降低而增加，以形成纯YAG，这是因为由化学均一性较高的前体生产的YAG粉末具有较小的粒径和较弱的团聚作用。通过改进的Pechini方法合成的YAG粉末显示出最差的烧结性，因为它是由母盐直接热解引起的极硬的聚集体。通过反向撞击共沉淀法生产的最易烧结的YAG粉末在1520摄氏度，8摄氏度/分钟的恒定加热速率下烧结后，致密化了其理论密度的91.86％。在相同的烧结条件下，通过改良的Pechini方法合成的YAG粉末仅致密化至其理论密度的69.2％。

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