您的位置:首页  > 论文页面

B4C/石墨复合改性酚醛树脂基超高温导电胶黏剂的强度演变特性

发表时间:2012-05-15  浏览量:1173  下载量:352
全部作者: 王继刚,袁宏观,张寿春
作者单位: 东南大学材料科学与工程学院,江苏省先进金属材料高技术研究重点实验室;中国科学院山西煤炭化学研究所
摘 要: 为实现炭、石墨材料的高温连接,以酚醛树脂(phenol formaldehyde,PF)为胶黏剂基体,B4C/石墨作复合改性填料,配制得到超高温导电胶。分别将纯酚醛树脂基体和导电胶本体进行热模压固化,再进行200~1 200℃的热处理,对比测试不同温度热处理后的室温抗压强度。通过数据对比和增强机制分析发现,强度的演变呈现出双抛物线规律:600℃以下热处理温度区间,强度迅速劣化;600℃以上的经进一步热处理,力学性能则呈现出一定的回升。B4C对改善力学性能发挥主要作用,但作为导电填料的石墨粉添加过多,则不利于粘接强度的稳定。为进一步验证粘接强度,分别利用纯酚醛树脂和高温胶黏剂对石墨样品进行粘接,并在同样条件下进行高温热处理和粘接剪切强度的测试,亦发现同样规律,同时将较为理想的胶黏剂配比优化确定为PF∶B4C∶石墨粉=100∶75∶25.
关 键 词: 功能高分子材料;超高温导电胶;剪切强度;酚醛树脂;碳化硼;石墨
Title: Study on mechanical performance evolution of ultra-temperature conductive adhesive co-modified by B4C/graphite
Author: WANG Jigang, YUAN Hongguan ,ZHANG Shouchun
Organization: School of Materials Science and Engineering, Southeast University, Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University; Institute of Coal Chemistry, Chinese Academy of Sciences
Abstract: In order to realize joining of carbon and graphite materials which is usually used at high temperatures, ultra temperature conductive adhesives were prepared by using phenol formaldehyde (PF) resin as matrix and B4C and graphite powders as additives. The pure PF resin matrix and adhesives were hot-pressed respectively, and then heat-treated at high temperatures ranging from 200 to 1 200°C. The compressive strengths of all the specimens were tested at room temperature. Based on the analysis of obtained data and modification mechanism, double-parabolic evolution of mechanical performance was observed. Below 600°C, the strength of both the pure PF matrix and adhesives kept on decreasing. On the contrary, a re-increase of the mechanical performance occurred with the further elevation of heat-treatment temperatures. The main reinforcement effect should be contributed to boron carbide. Mainly as the conductive component, the excessive addition of graphite powder showed little effect on adhesive strength. The adhesive experiments were also carried out using pure PF resin and adhesive, respectively, and the same regularity of strength evolution was observed, and the optimized ratio for the high-temperature conductive adhesive can be confirmed as PF∶B4C∶graphite powder=100∶75∶25.
Key words: functional polymer materials; ultra-temperature conductive adhesive; shear strength; phenol formaldehyde; boron carbide; graphite
发表期数: 2012年5月第9期
引用格式: 王继刚,袁宏观,张寿春. B4C/石墨复合改性酚醛树脂基超高温导电胶黏剂的强度演变特性[J]. 中国科技论文在线精品论文,2012,5(9):852-857.
 
0 评论数 0
暂无评论
友情链接