面向再制造的环境友好型连接技术

Environment Friendly Technology of Joining Used in Remanufacturing

研究了面向再制造的环境友好型连接技术,讨论了摩擦焊、扩散焊、钎焊以及陶瓷薄片焊的方法。提出金属和弹性材料(如Al_2O_3)之间可以通过摩擦焊进行连接,考虑了压力、应变和温度在连接面的不均分布,确定了连接中Al扩散到Al_2O_3对自身应力状态的影响。Al扩散到Al_2O_3的系数约为1.8×10^(-13)(m/s),扩散引起的应力范围为0.2～0.8 MPa。扩散焊连接金属合金(如Fe-Al)与结构钢可以得到高抗拉性,应力范围为304～362MPa。Al_2O_3与添加钛的金属合金通过扩散焊进行连接,该方法适用于旋转设备上的轴类连接。上述连接方法不仅适用于实验室研究,还可用于工业生产。

In the article the review of friendly method of joining materials for the use in remanufacturing is presented. Friction welding, diffusion welding, vacuum soldering and bonding through ceramic foil were discussed. On the basis of literature analysis and the author＇s own works as well as the works of his doctoral students, the possibility of the friction welding of metals with elastic materials e.g. A1203 was presented. It was considered that the uneven distribution of pressures, strains and temperature on the joined surfaces took place. The influence of A1 diffusion to A1203 on the state of self stresses in the joint was determined. The coefficient of A1 diffusion to A1203 was estimated at 1.8×10^-13（m/s）, and stresses caused by diffusion were within the range of 0.2 to 0.8 MPa. Diffusively welded inter-metallic alloys of Fe-A1 type with the constructional steel were characterized with the high tear resistance within the range of 304 to 362 MPa.The presented example of the diffusion welding of Al2O3 with metallic alloys, with the addition of Ti to the metal which is joined with A1203, is used to join shafts, working in rotating machines. The discussed methods of joining may be used not only in laboratory-research works but also in industrial ones.