铝基复合焊丝制备工艺研究

Study on the Parameters of Preparation Process of Aluminum Silicon Alloy Based Flux Composite Wire

采用设定粒度范围的铝硅合金粉末与氟铝酸钾钎剂粉末混合后压坯、烧结、加热挤压成丝的工艺,制备了铝基复合焊丝。研究了压制压力、烧结、加热挤压对粉坯密度及丝材的影响。研究结果表明:从0~50MPa范围内粉坯的密度随冷等静压压力的升高,从初始零压的1.06g/cm^3急剧升高到1.97g/cm^3;加压到50MPa以上,粉坯的密度增加变缓慢。在研究的温度范围,加压烧结可使粉坯达到理论密度的93%以上;加热挤压粉坯可得到密度达到理论密度的97%的铝基复合焊丝,具有实用价值。

The aluminum silicon alloy powder and potassium fluoride powder with certain size range are mixed for compaction, sintering and finally heating extrusion into thin wire, applied this process to produce the flux composite wires. The influence of pressing pressure, sintering, hot extrusion on the density of the powder compact and wire are studied. The results show that the density of powder compacts increase steeply from 1.06 g/cm3 tol.97 g/cm3 as the appliedcold isostaticpressure increased from 0 to 50MPa; when applied pressures increase over 50MPa, the density increase of the powder compacts slow down, Within the range of the sinter temperature, the densities of the powder compacts are less effected by sintering operation; press sintering of the powder compacts can increase the densities of the compacts to over 93% relative density; hot pressing operation can increase the density of the flux composite wire to 97% relative density, the flux composite wire has practical application.