以硝酸氧锆[ZrO(NO3)2·5H2O]和钨酸铵(H40N10O41W12·xH2O)为原料,采用共沉淀法合成了低热膨胀的ZrO2-ZrW2O8复合陶瓷, 着重研究了不同热处理条件对前驱体转变为ZrO2-ZrW2O8复合陶瓷的影响, 并探讨了前驱体生成及其转变的反应历程. 通过X射线衍射仪(XRD)、热重-差示扫描量热(TG-DSC)、扫描电子显微镜(SEM)、热膨胀仪等分析手段对样品的晶体结构、物相转变、断面微观形貌和热膨胀性能进行表征. 结果表明: 采用共沉淀法制备的前驱体在1150℃热处理2h可以合成高纯度、混合均匀的ZrO2-ZrW2O8复合陶瓷; 随烧结时间的延长, ZrW2O8衍射峰半高宽逐渐减小, 晶粒在不断长大; ZrO2-50wt%ZrW2O8复合陶瓷在30～600℃内的平均热膨胀系数为-3.2295×10-6K-1.
A low-thermal-expansion ceramic composite of ZrO2-ZrW2O8 was synthesized by co-precipitation route using analytically pure zirconium nitrate [ZrO(NO3)2·5H2O] and ammonium tungstate(H40N10O41W12·xH2O) as starting materials. Effects of heat-treatment on the transformation from the precursor to ZrO2-ZrW2O8 composite were investigated, and the chemical reaction process of the precursor was explored. The crystal structure, phase transition, cross-section morphology and thermal expansion coefficient of the samples were investigated by X-ray diffraction(XRD), thermogravimetric and differential scanning calorimetry(TG-DSC), scanning electron microscope(SEM) and dilatometry respectively. The results show that the homogeneous ZrO2-ZrW2O8 composites are synthesized after sintering at 1150℃ for 2h. With the increase of sintering time, the full width at half maximum (FWHM) of the ZrW2O8 diffraction peaks decreases, and the grain grows up gradually. ZrO2-50wt%ZrW2O8 composite has an average thermal expansion coefficient of -3.2295×10-6K-1 from 30℃ to 600℃.
参考文献
| [1] | Mary T A, Evans J S O, Sleight A W, et al. Science, 1996, 272 (5): 90--92. [2] Evans J S O, Mary T A, Vogt T, et al. Chem. Mater., 1996, 8: 2809--2823. [3] Evans J S O, Hu Z, Jorgensen J D, et al. Science, 1997, 275 (3): 61--65. [4] Perottoni C A, Jornada J A H. Science, 1998, 280 (8): 886--889. [5] Ravindran T R, Arora A K, Mary T A. Phys. Rev. Lett., 2000, 84 (17): 3879--3882. [6] Evans J S O. Chem. Soc., 1999, 19: 3317--3326. [7] 沈 容, 王 聪, 王天民(SHEN Rong, et al). 无机材料学报(Journal of Inorganic Materials), 2002, 17 (6): 1089--1094. [8] 饶晓晓, 胡树兵(RAO Xiaoxiao, et al). 材料导报(Materials Review), 220, 75 (21): 143--146. [9] 邵忠财, 彦 文, 翟玉春, 等(SHAO Zhong-Cai, et al). 无机材料学报(Journal of Inorganic Materials), 1999, 14 (3): 397--402. [10] Chang L L Y, Scroger M G, Philips B. Ceram. Soc., 1967, 50 (2): 211--215. [11] Lommens P, De Meyer C, Bruneel E, et al. J. Euro. Ceram. Soc., 2005, 25 (16): 3605--3610. [12] Klaartje D B, Lommens P, Meyer D C, et al. Ceramics-Silikaty, 2004, 48 (4): 139--144. [13] Niwa E, Wakamiko S, Ichikawa T, et al. J. Ceram. Soc. of Japan, 2004, 112 (5): 271--275. [14] Yang Xinbo, Cheng Xiaonong, YAN Xuehua, et al. Compos. Sci. Technol., 2007, (67): 1167--1171. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%