胶体石墨对低温金属树脂复合结合剂性能的影响

在铝基金属树脂复合结合剂中添加质量分数为0～0.4%的微量胶体石墨，研究复合结合剂的强度、硬度、微观组织及其反应结合机理。结果表明:在烧结温度为360 ℃，保温时间为5 min，保温压力为2 100 N/cm2条件下，随着胶体石墨质量分数增加，复合结合剂的密度先下降再上升随后又下降; 硬度、强度和弹性模量都是先上升再下降。在胶体石墨添加质量分数为0.2%时，复合结合剂的硬度和强度达最大值，分别为61.5 HRB和250 MPa，且复合结合剂的密度和弹性模量适中。微量胶体石墨可以和复合结合剂中的Al生成少量Al₄C₃，促进三维交叉网状结构形成，提高低温金属树脂复合结合剂性能。 

Effect of colloidal graphite on properties of low temperature metal-resin composite bond

The strength, the hardness, the microstructure and the reaction bonding mechanism of the composite bond were studied by adding mass fraction of 0~0.4% trace colloidal graphite to the aluminum-based metal-resin composite bond. The results show that when the sintering temperature is 360 ℃, the holding time is 5 min, and the holding pressure is 2 100 N/cm2, with the increase of the mass fraction of colloidal graphite, the density of the composite bond first decreases, then increases and finally decreases; the hardness, the strength and the elastic modulus all increase first and then decrease. When the added mass fraction of the colloidal graphite is 0.2%, the hardness and the strength of the composite bond reach the maximum values of 61.5 HRB and 250 MPa, respectively, and the density and the elastic modulus of the composite bond are moderate. Trace colloidal graphite can react with Al in the composite bond to form a small amount of Al₄C₃, which promotes the formation of three-dimensional cross network structure and improves the properties of low-temperature metal-resin composite bond.