化学改性发泡剂对泡沫铝材料性能的影响

采用熔体发泡法，利用化学镀镍改性的TiH₂作为发泡剂制备了泡沫铝，分析了改性TiH₂发泡剂的热分解行为，研究了改性TiH₂发泡剂加入量对泡沫铝材料孔隙率、压缩性能和阻尼性能的影响.结果表明，改性TiH₂发泡剂有效提高了释氢反应的开始温度，将释氢反应开始温度从480℃提升至550℃，并降低了释氢速率;随着改性发泡剂添加量的增加，泡沫铝的孔隙率增大，压缩强度变小，阻尼性能呈现先增大后减小的变化趋势;当加入质量分数1.5%的改性发泡剂时，泡沫铝的孔隙率达88%，孔洞分布及尺寸相对均匀，压缩强度、阻尼性能等综合性能良好.

Effects of Chemical Modified Gas-Generating Agent on the Properties of Aluminum foam

The aluminum foam was prepared by melt foaming method using chemical modified TiH₂ as gas-generating agent and the effect of the TiH₂ addition on the porosity， compressive and damping properties of aluminum foam was studied. The results show that using chemical modified TiH₂ as gas-generating agent can increase the starting temperature of releasing H₂ from 480℃ to 550℃ and decrease the rate of releasing H₂.With increasing the TiH₂ addition， the porosity of aluminum foam increases， the compressive stress decreases and the damping property firstly increases and then decreases. When the mass percentage of the TiH₂ addition is 1.5%， the porosity of aluminum foam is up to 88%， the size and distribution of pores are uniform， and the compressive and damping properties of the foam are well improved.