论文部分内容阅读
利用快速升温法在致密Ti罐或两Ti板夹层中制备Ti-Al合金泡沫夹层材料,通过添加不同量的发泡剂和升温速度控制Ti-Al发泡程度以及孔隙的多少、大小、取向和分布。实验发现:当发泡剂含量大于11%时,开始具有发泡效果,发泡剂含量在13%～15%之间,发泡量、孔径大小和孔径分布比较理想,发泡剂含量大于17%时,形成大孔,且中间的泡最大;当升温速度大于25℃/min时,开始具有发泡现象,随着升温速度继续增加,发泡程度增大,孔隙由少变多,孔径由小变大;当升温速度大于75℃/min时,中间孔隙大部分重合,成大空洞。大量实验发现升温速度是影响孔隙形状、尺寸、取向和分布的主要因素。保温温度和时间是强度大小的主要因素,测试其不同温度下压缩屈服强度,均高于纯钛泡沫材料,具有较高的高温压缩屈服强度。
Ti-Al alloy foam sandwich material was prepared by rapid heating method in dense Ti can or Ti-Ti sandwich. The foaming degree of Ti-Al and the number of pores, size, orientation and distributed. The experimental results show that when the content of foaming agent is more than 11%, the foaming agent begins to have foaming effect, the content of foaming agent is between 13% and 15%, the foaming amount, pore size and pore size distribution are ideal. The foaming agent content is more than 17 %, The formation of large holes, and the largest bubble in the middle; when the heating rate is greater than 25 ℃ / min, began to have foam, with the heating rate continues to increase, the degree of foaming increases, Small and large; when the heating rate is greater than 75 ℃ / min, most of the overlap between the middle of the pores, into a big hole. A large number of experiments found that the rate of heating is affecting the pore shape, size, orientation and distribution of the main factors. Insulation temperature and time are the main factors of strength. The compressive yield strength under different temperature is tested, which is higher than that of pure titanium foam and has high high temperature compressive yield strength.