Ni-Cr-Co-W-Mo-Al-Ti合金制备多孔材料的组织与性能研究

用粉末烧结法制备了孔结构为球形中空孔和线型中空孔的镍基多孔高温合金材料.对试样进行显微组织观察和力学性能测试.结果表明:制备的多孔高温合金材料的孔隙分布均匀,孔径大小一致.通过高温烧结,多孔合金骨架处的金属颗粒之间形成了烧结颈,发生了烧结结合.生成孔的孔隙度随造孔剂(尿素)的添加量增加而增加,当造孔剂的质量分数为40%时,可得到孔隙度为81.62%的球形多孔材料.多孔材料具有优良的能量吸收性能,其压缩性能随孔隙度和孔径的增加而下降.

Research on the structure and mechanical properties of Ni-Cr-Co-W-Mo-Al-Ti porous superalloy

The porous superalloy materials with hollow spherical and oriented linear pores were fabricated by means of powder metallurgy using nickel-base superalloy powders.Structure observation reveals that the pores of the porous material exhibit a uniform distribution and the apertures are of same size in principle.The sintering necks create between adjacent particles on metal skeleton after sintering.The porosity of the porous material increase with increasing the addition of pore forming agent,and the hollow spherical porous material with a porosity of 81.62% can be obtained when the addition of pore forming agent is 40%.The compression test indicates that this kind of materials possess excellent energy absorption capability,and the compression resistance decreases with the increasing of porosity and aperture.