用纳米粉制备厚膜敏感陶瓷材料
发布时间:2008/6/5 0:00:00 访问次数:442
王梦魁1,王志凡1,刘文磊2 | |||||
(1.锦州师范学院物理系,辽宁 锦州 121003; 2.丹东国通电子元件有限公司,辽宁 丹东 118002) | |||||
1introduction with the development of sensing technology,people are more and more demanding about sensors,especially for fitting in computers,high property and miniaturized sensors. thickfilm sensing materials have vast developing prospects,because the technology of making thickfilm sensing materials is easy to learn and a large scale production can be easily realized. in recent years,with the fast development of nanomaterial and nanotechnology,many technological puzzles can be readily solved. for instance,in the past,it was difficult to make ba1-xsrxtio3 base sensitive ceramics into low resistivity thickfilm material,but now they can be made into nanogranules,and the electric polarization strength of the material will be improved obviously. in this way,thickfilm material of low room temperature resistivity and excellent properties will surely be made. the way of preparing ba1-xsrxtio3 and(v1-xcrx)2o3 double base composite material with nanopowders was discussed in this study. 2experimentsand measured results 2.1preparing ba1-xsrxtio3 micro powders through chemical coprecipitation the materials for making ba1-xsrxtio3 micropowders were barium chloride(bacl2),strontium chloride(srcl2)and titanium chloride(ticl4),oxalic acid was precipitant. the chemical equations were as follows ticl4+(1-x)bacl2+xsrcl2+2(h2c2o4·2h2o)+2h2o=ba1-xsrxtio(c2o4)2·4h2o+6hcl+h2o (1) ba1-xsrxtio(c2o4)2·4h2o+o2=ba1-xsrxtio3+4h2o+4co2↑(2) the equations above were the theoretical basis for calculating the composition and operating the process when preparing the micropowders. the process was shown in fig.1. the average diameter of the ba1-xsrxtio3 micropowders attained with this method was shorter than 05 μm when they were measured by type wlp208 average granules measuring instrument. the distribution was shown in fig
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