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mymuchong207
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jinch0417(金币+2,VIP+0):谢谢
jinch0417(金币+2,VIP+0):谢谢
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Densification of “active” zirconia powders during hot pressing Journal Refractories and Industrial Ceramics Publisher Springer New York ISSN 1083-4877 (Print) 1573-9139 (Online) Issue Volume 8, Numbers 7-8 / July, 1967 Category Research DOI 10.1007/BF01284814 Pages 434-439 Subject Collection Chemistry and Materials Science SpringerLink Date Wednesday, March 30, 2005 I. S. Kainarskii1, L. S. Alekseenko1 and É. V. Degtyareva1 (1) Ukraine Research Institute of Refractories, Ukraine Conclusions We studied the influence of temperature and heat process time for zirconium nitrate on the phase composition, dispersion of grains and crystalline lattice defects in the resulting zirconia, and also on its capacity for subsequent compaction during hot pressing. This capacity is connected with the formation, during a short heating period up to 400°C, of metastable tetragonal and cubic modifications having a highly defective crystalline lattice. We also studied the densification during hot pressing of active zirconia obtained by decomposing zirconium nitrate. During decomposition of zirconium nitrate at 400°C with a short soak we noted the formation of zirconium dioxide which was actively compacted at 1100°C and a pressure of 200 kg/cm2. We studied the influence of additions of CaO and the methods of adding it on the densification of active zirconia. An increase in the content of CaO leads to a reduction in the capacity of ZrO2 for compaction during hot pressing. It is necessary to introduce the additive to the nitrate before it decomposes. During hot pressing of active zirconia containing additions of CaO and Y2O3 at low temperatures (1100–1300°C) cubic solid solutions are not formed owing to the short process time, and the zirconia in the specimens consists of monoclinic form. Subsequent heating of the pressed specimens forms cubic solid solutions. It was found that the introduction of 10–20% additive of zirconia obtained by heat processing the nitrate to industrial ultrapure zirconium dioxide yields dense specimens with a reduction in the optimum pressing temperature of 200°C. |
6楼2007-12-26 20:36:10
cherish02
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jinch0417(金币+2,VIP+0):高温分解的温度能帮我查到不
jinch0417(金币+2,VIP+0):高温分解的温度能帮我查到不
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化学品中文名称： 硝酸锆 化学品英文名称： zirconium nitrate 中文名称2： 英文名称2： dusicnan zirkonicity CAS No.： 12372-57-5 分子式： Zr(NO3)4 分子量： 339.24 健康危害： 对眼睛、皮肤、粘膜有刺激作用。工业上接触尚未见有中毒病例。在高温下可分解，释放出剧毒的氮氧化物气体，吸入后可引起中毒。 外观与性状： 白色板状结晶, 有吸湿性。 相对密度(水=1)： 1.40 溶解性： 溶于水，溶于乙醇。 主要用途： 用作防腐剂、试剂及用于锆盐制造 危险特性： 无机氧化剂。遇可燃物着火时，能助长火势。与还原剂、有机物、易燃物如硫、磷或金属粉末等混合可形成爆炸性混合物。受高热分解，产生有毒的氮氧化物。 |
2楼2007-12-26 16:20:50
3楼2007-12-26 16:23:42
nmliujianguo
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4楼2007-12-26 16:25:40
