水溶性共聚物为交联剂的凝胶注成型AlN陶瓷的研究

doi:10.3724/SP.J.1077.2014.13488

无机材料学报 ›› 2014, Vol. 29 ›› Issue (3): 327-330.DOI: 10.3724/SP.J.1077.2014.13488 CSTR: 32189.14.SP.J.1077.2014.13488

水溶性共聚物为交联剂的凝胶注成型AlN陶瓷的研究

舒夏^1,2, 李军¹, 张海龙¹, 董满江¹, 岛井骏臧¹, 王士维¹

(1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 中国科学院大学, 北京 100864)

收稿日期:2013-09-29 出版日期:2014-03-20 网络出版日期:2014-02-18
作者简介:舒夏. E-mail: shuxia1987@gmail.com

Gelcasting of Aluminum Nitride Using a Water-soluble Copolymer

SHU Xia^1,2, LI Jun¹, ZhANG Hai-Long¹, DONG Man-Jiang¹, SHUNZO Shi-Mai¹, WANG Shi-Wei¹

(1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. University of Chinese Academy of Sciences, Beijing 100864, China)

Received:2013-09-29 Published:2014-03-20 Online:2014-02-18
About author:SHU Xia (1987-), male, candidate of M.D. E-mail: shuxia1987@gmail.com

摘要/Abstract

摘要：

本研究采用一种快速凝胶的氮化铝凝胶通过在氮气气氛下烧结制备AlN陶瓷。将AlN粉体、少量的Y₂O₃粉体(烧结助剂)和去离子水以一定比例混合制得AlN浆料, 在浆料中加入一种新型的水溶性共聚物Isobam(由异丁烯和马来酸酐形成的共聚物)作为交联剂, 所得浆料在室温空气中自发凝胶成型。研究了Isobam和AlN、Y₂O₃粉体表面的有机包裹剂聚亚氨酯对浆料流变性能和凝胶性能的影响。结果表明, 加入0.3wt% Isobam可制备出固含量达52vol%的低粘度(0.2 Pa·s)AlN浆料。将凝胶干燥并脱粘, 获得的AlN素坯在氮气气氛下1800 ℃烧结4 h, 可制备出鳍状AlN陶瓷, 所得陶瓷的密度为3.33 g/cm³, 热导率为204 W/(m·K)。

关键词: 凝胶注, AlN, Isobam, 流变性能

Abstract:

AlN ceramic was fabricated via a rapid gelation of AlN slurry and sintering in nitrogen at 1800 ℃ for 4 h. The AlN slurry was made of AlN powder, small amount of Y₂O₃ powder (sintering aid), deionized water. A new water-soluble copolymer of isobutylene and maleic anhydride (commercial name Isobam) was added into the slurry, and the resultant slurry gelled spontaneously in air at room temperature. The effects of Isobam and polyurethane on rheological properties and gelling behavior were evaluated. Results showed that concentrated AlN slurry (52vol%) with low viscosity (0.2 Pa·s) was obtained with an addition of 0.3wt% Isobam. The final AlN ceramic had a fin-like shape, a density of 3.33 g/cm³ and a thermal conductivity of 204 W/(m·K).

Key words: gelcasting, AlN, Isobam, rheological properties

中图分类号:

TQ174

舒夏, 李军, 张海龙, 董满江, 岛井骏臧, 王士维. 水溶性共聚物为交联剂的凝胶注成型AlN陶瓷的研究[J]. 无机材料学报, 2014, 29(3): 327-330.

SHU Xia, LI Jun, ZhANG Hai-Long, DONG Man-Jiang, SHUNZO Shi-Mai, WANG Shi-Wei. Gelcasting of Aluminum Nitride Using a Water-soluble Copolymer[J]. Journal of Inorganic Materials, 2014, 29(3): 327-330.

图/表 7

Fig. 1 Variation of pH in aqueous AlN slurries containing coated and uncoated AlN powders

Fig. 2 Effect of Isobam addition on Zeta potential of coated AlN powder

Fig. 3 Rheological curves of 52vol% AlN slurries with various Isobam additions

Fig. 4 Rheological curves of AlN slurries with 0.3wt% Isobam and different solids loadings

Fig. 5 Change of storage modulus during gelation

Fig. 6 Sintered AlN parts fabricated by gelcating

Fig. 7 Fractured surface of sintered AlN

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水溶性共聚物为交联剂的凝胶注成型AlN陶瓷的研究

Gelcasting of Aluminum Nitride Using a Water-soluble Copolymer

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