金属与陶瓷耐高温胶黏剂的研究

Study on adhesives for bonding metals to ceramics

以线性酚醛树脂为固化剂,硅微粉为填料剂,采用缩合型聚酰胺酸(PAA)对邻甲酚甲醛环氧树脂(ECN)进行改性,制备一种适用于金属与陶瓷的耐高温胶黏剂。考察了聚酰胺酸的加入量、线性酚醛树脂的加入量对胶黏剂的耐热性和胶结件力学性能的影响,确定较佳方案:37.7%邻甲酚甲醛环氧树脂,5.7%PAA,22.6%线性酚醛树脂,34%硅微粉。在此配方下制备的耐高温胶黏剂可使陶瓷与钢件胶结件的剪切强度和弹性模量达到12.95 MPa和27.4 GPa,胶黏剂热分解温度为417℃,力学和耐热性能明显提高。

In order to prepare a heat-resistance adhesive to metal and ceramic,a condensed polyamide acid（ PAA）is used to modify the o-cresol formaldehyde epoxy resin（ ECN） with novolac resin as curing agent and micro Si O2 as filler. The effects of PAA and novolac resin amount on the thermal resistance property of adhesives and mechanical property of cement parts are studied. The optimal conditions are： 37. 7% of o-cresol formaldehyde epoxy resin,5. 7% of PAA,22. 6% of novolac resin and 34% of micro Si O2. Under this condition,the shear strength and the elastic modulus of the adhesive can reach up to 12. 95 MPa and 27. 4 GPa,respectively. The thermal decomposition temperature of the adhesive is 417℃. These data shows that the mechanical and thermal performances of the adhesive have been significantly improved.