以CaO-SiO 2-B2O 3体系作为α-Si 3 N4 的结合剂和助烧剂, 采用溶胶-凝胶法在多孔氮化硅表面制备了防潮增强涂层. 采用X射线衍射(XRD)方法对涂层进行了相结构分析; 用扫描电子显微镜(SEM)观察了涂层的微观形貌; 用阿基米德法测量了封孔前后基体的密度、吸水率和显气孔率; 分别在SANS电子式材料实验机和1MHz LCR测试仪上测量了封孔前后材料的抗弯强度、介电常数和介电损耗. 结果表明: 封孔防潮处理使基体吸水率下降了90.99%～96.97%, 强度提高了9%～22%, 而对多孔体的密度、介电常数和介电损耗影响很小.
Damp-proof and enhanced coating was fabricated on the porous Si3N4 substrate by sol-gel method, with CaO-SiO 2-B2O3 as adhesive and sintering aids. The phase structure of the coating was characterized by X-ray diffraction (XRD). The morphology of the coating was characterized by scanning electron microscope (SEM). The density, water absorption and porosity of the porous Si3N4 were tested by Archimedes method. The bending strength of the coating was measured with SANS materials testing machine. The dielectric constant and dielectric loss were measured with the LCR tester model YY2813B. The results show that the water absorption of the porous Si3N4 is decreased by 90.99% to 96.97%, the bending strength of the porous Si3N4 is increased by 9% to 22%, the density, dielectric constant and dielectric loss of the porous Si3N4 are influenced little by sealing process.
参考文献
| [1] | Lu Horng-hwa, Huang Jow-lay. Ceramics International, 2001, 27 (6): 621--628. [2] Goto Y, Thomas G. Acta. Metall. Mater., 1995, 43 (3): 923--930. [3] Chiang Chuang-Chung, Wang Sea-Fue, Wang Yuh-Ruey, et al. Ceram. Int., 2008, 34 (3): 599--604. [4] Chang C R, Jean J H. Am. Ceram. Soc., 1999, 82 (7): 1725--1732. [5] Wang S H, Zhou H P. Mater. Sci. Eng. B, 2003, 99: 597--600. [6] Zhang Y F, Zhang J X, Lu Q M, et al. Materials Letters, 2006, 60: 2443--2446. [7] Leguillon D, Piat R. Eng. Fract. Mech., 2008, 75 (7): 1840--1853. [8] 周美玲, 滕祥红, 赵小玻, 等. 硅酸盐通报, 2005, 24 (4): 3--5. [9] 黎义, 李建保, 张大海, 等. 宇航材料工艺, 2001, 31 (6): 4--9. |
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