论文部分内容阅读
采用粉末冶金技术制备了孔隙和HA相均呈梯度分布的双梯度多孔HA/Mg复合材料。研究了造孔剂及HA含量与分布对复合材料孔隙度和抗压强度的影响,观察了烧结产物的显微组织,测量了复合材料的耐腐蚀性能。结果表明,随着中间层造孔剂含量的增加,双梯度多孔HA/Mg复合材料的孔隙度增加、抗压强度降低。随着表层HA含量的增加,梯度多孔HA/Mg复合材料的孔隙度升高,抗压强度降低。耐腐蚀性分析表明,随着孔隙度增加,复合材料的耐腐蚀性降低,与梯度多孔Mg材料相比,双梯度HA/Mg复合材料具有更好的耐腐蚀性能。随着表层HA含量的增加,腐蚀速率降低,溶液的pH值缓慢增加。
Two-gradient porous HA / Mg composites with gradient distribution of pores and HA phases were prepared by powder metallurgy. The effects of pore former and HA content and distribution on the porosity and compressive strength of the composites were studied. The microstructure of the sintered products was observed and the corrosion resistance of the composites was measured. The results show that the porosity of the dual gradient porous HA / Mg composites increases and the compressive strength decreases with the increase of the pore-forming agent in the interlayer. With the increase of surface HA content, the porosity of gradient porous HA / Mg composites increases and the compressive strength decreases. The analysis of corrosion resistance shows that the corrosion resistance of the composites decreases with the increase of porosity, and the dual-gradient HA / Mg composites have better corrosion resistance than the gradient porous Mg materials. With the increase of surface HA content, the corrosion rate decreases and the pH value of the solution increases slowly.