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机械球磨混合法
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  mechanical ball-mixing method
     Compared with mechanical ball-mixing method, MgAl 2O 4 prepared by wet-chemical method is possessed of high purity,large specific surface area,high activity and easy obtained under low calcination temperature(under 900℃).
     与机械球磨混合法相比,湿化学法制备的均匀超细MgAl2O4粉末,具有纯度高、比表面积大、且活性高、易于较低温度(900℃)下煅烧获得等特点。
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Compared to fine-grained PSZ ceramics prepared by coprecipitation, the costabilized (Y,Mg)-PSZ and (Ce, Mg)-PSZ wigh MgA12O4 spinel additions were developed, in which industrialzirconia was used as the main starting material. Powders were prepared by mechanical millingmixing process. During mixing process, distilled water was patially used as ball-milling mediuminstead of ethanol. Feasibility for milling-miaing in distilled water was studied. The experimelltaJresults showed that fine-grained PSZ ceramics sintered...

Compared to fine-grained PSZ ceramics prepared by coprecipitation, the costabilized (Y,Mg)-PSZ and (Ce, Mg)-PSZ wigh MgA12O4 spinel additions were developed, in which industrialzirconia was used as the main starting material. Powders were prepared by mechanical millingmixing process. During mixing process, distilled water was patially used as ball-milling mediuminstead of ethanol. Feasibility for milling-miaing in distilled water was studied. The experimelltaJresults showed that fine-grained PSZ ceramics sintered at low solid solution temperature (S1550"C)could be aChieved by mechanical mixing process, as well as coprecipitation. These materials hadgood mechanical properties: the fie-cural strength and fracture toughness at room temperaturewere about 700MPa and 15MPa.m1/2, respectively. After hydrothermaJ treatment (180"C, IMPa,in distilled water) up to 20h, (Ce, Mg)-PSZ materials exhibited much better thermal stability than(Y, Mg)-PSZ ceramics.

在化学共沉淀法制备细晶PSZ陶瓷的基础上,用工业ZrO2作原料,以MgO、Y2O3、CeO2及α-Al2O3作为复合稳定剂及添加剂,采用机械球磨混合法,并在制备过程中部分用去离子水代替乙醇作为球磨介质,探讨了水磨混合法制备粉料的可行性.实验结果表明:在较低的固溶烧结温度(1550℃)下,经1100℃适当时间热处理,亦可制备出具有较好力学性能的细晶PSZ陶瓷材料,其室温强度约700MPa,断裂韧性在15MPa·m1/2左右;在(180℃,1MPa)水热条件下,采用CeO2作复合稳定剂的PSZ陶瓷材料要比Y2O3复合稳定的PSZ材料更具良好的抗水化性.

MgAl 2O 4,as the only stable binary compound in the MgO-Al_2O_3 system,is prepared by chemical co-precipitation method using MgCl_2·6H_2O and AlCl 3·6H 2O as raw materials. Compared with mechanical ball-mixing method, MgAl 2O 4 prepared by wet-chemical method is possessed of high purity,large specific surface area,high activity and easy obtained under low calcination temperature(under 900℃).

以MgCl2·6H2O和AlCl3·6H2O为主要原料,利用化学共沉淀法制备MgO-Al2O3系中唯一稳定的二元化合物MgAl2O4粉末。与机械球磨混合法相比,湿化学法制备的均匀超细MgAl2O4粉末,具有纯度高、比表面积大、且活性高、易于较低温度(900℃)下煅烧获得等特点。

 
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