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应用正电子湮没技术,对掺杂Y2O3的ZnO导电陶瓷烧结过程进行了研究,给出了烧结温度对导电特性、局域电子密度、结构缺陷的影响特征。研究发现:提高烧结温度,Zn填隙离子迅速迁移,ZnO导电陶瓷电阻率明显下降,同时产生大量微空洞缺陷。 相似文献
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采用溶胶-凝胶法制备了Sm2O3掺杂的PbTiO3陶瓷,并对其制备条件和电性能进行了研究。结果表明:Sm2O3掺杂能够缩短凝胶形成时间,降低PbTiO3陶瓷烧结温度,改善烧结性能;Sm2O3掺杂PbTiO3陶瓷的电阻率均低于纯PbTiO3陶瓷,当掺杂量为0.003(n(Sm2O3)∶n(PbTiO3))时,电阻率最低,为5.8×108Ω·m;通过XPS分析,得到了Sm2O3掺杂PbTiO3陶瓷中各元素的结合能位置,表明Sm3+、Ti4+等都存在着不同程度的变价,导致了PbTiO3陶瓷导电性的提高。 相似文献
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采用固相法制备新型复合稀土Sc2O3和Y2O3掺杂ZnO-Bi2O3基压敏陶瓷,并对其显微组织和电性能进行了分析.结果表明,复合稀土掺杂可提高压敏陶瓷的综合性能,并明显优于单一稀土掺杂,复合稀土掺杂对压敏陶瓷电性能的影响规律仍遵循单一稀土掺杂对压敏陶瓷电性能的影响规律.新型复合稀土Sc2O3和Y2O3掺杂ZnO-Bi2O3基压敏陶瓷,在相同的Sc2O3掺杂比例下,随Y2O3掺杂量的增加,电位梯度呈增加的趋势;在相同的Y2O3掺杂比例下,随Sc2O3掺杂量的增加,非线性系数呈增加的趋势.当掺杂Sc2O3的摩尔分数为0.12%、Y2O3的摩尔分数为0.20%时,复合稀土掺杂ZnO-Bi2O3基压敏陶瓷的综合电性能最为理想,电位梯度为410V.mm-1,非线性系数为38.0,漏电流为0.58μA. 相似文献
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机械活化-放电等离子烧结制备Y3Al5O12陶瓷 总被引:1,自引:0,他引:1
以高纯Y2O3和Al2O3粉体为原料,通过机械活化和放电等离子烧结制备Y3Al5O12(YAG)陶瓷.研究结果表明:机械活化Y2O3和Al2O3粉体,不但细化了Al2O3颗粒,而且使Y2O3发生了晶态转变,由立方晶转变为斜方晶,并最终非晶化;机械活化过程最终还合成了过渡产物YAlO3(YAP),但球磨5h后,继续延长球磨时间,会引入大量ZrO2杂质;球磨处理的Y2O3和Al2O3粉体具有很高的活性,能促进在较低温度下通过放电等离子烧结合成YAG.对球磨5h的粉体在不同温度进行放电等离子烧结的研究表明,在1000℃可获得纯YAG陶瓷,在1 400℃可得到相对密度为99.4%、晶粒大小为1~2μm的YAG陶瓷. 相似文献
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李家茂 《金属材料与冶金工程》2007,35(4):7-9,31
采用工业ZrO2和AlO3为原料,以Y2O3作为稳定剂,通过适当工艺制备出ZrO2增韧Al2O3(ZTA)陶瓷.主要研究了ZrO2和Y2O3稳定剂对ZTA陶瓷烧结性和抗钢液腐蚀性能的影响.实验结果表明:机械混合法引入的Y2O3在改善ZTA陶瓷的烧结性的同时,可以提高材料的抗钢液腐蚀性能;随ZrO2含量的增加,ZTA陶瓷的抗钢液腐蚀性能增强;材料中大量微裂纹的存在可以提高材料的韧性,但抗钢液腐蚀性能有所下降. 相似文献
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<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic 相似文献
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正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform. 相似文献
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正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness. 相似文献
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正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully. 相似文献