To explore the preparation of porous nickel- titanium alloy with excellent properties, larger size and complex shape, the premixed powder of Ni and Ti with atomic ratio of 1:1 was shaped by gel-casting. The effects o...To explore the preparation of porous nickel- titanium alloy with excellent properties, larger size and complex shape, the premixed powder of Ni and Ti with atomic ratio of 1:1 was shaped by gel-casting. The effects of solids loading and the content of dispersant on flow ability of nickel-titanium slurry and the mechanical properties of nickel-titanium sintered body were studied. The drying models under different solids loading were also discussed. The results show that the viscosity of slurries significantly increases with an increase in solids loading. After a proper process of drying, the green body with complex shape is obtained. The sintered body with porosity rate reaching up to 49.5 % and compression strength reaching to 364.74 MPa could meet the basic demands of implant materials.展开更多
文摘采用半干法厌氧生物反应器对分类后生活垃圾预处理产生的高浓度固体废弃物有机渗滤液进行厌氧消化处理,结果表明:通过接种厌氧微生物,可实现半干法厌氧反应器的快速启动。厌氧反应器pH值维持在7.4左右,ORP维持在-459m V,无酸化现象。随着反应器容积负荷提高,可能产生游离氨氮抑制,游离氨质量浓度宜控制在28~73 mg/L。半干法厌氧反应器最大容积负荷为13.44 g VS/(L·d),反应器底部残渣需要定期排出,防止厌氧反应器堵塞。
基金financially supported by the National Natural Science Foundation of China(No.51274246)the Project Supported by State Key Laboratory of Powder Metallurgy of China(No.26358766)
文摘To explore the preparation of porous nickel- titanium alloy with excellent properties, larger size and complex shape, the premixed powder of Ni and Ti with atomic ratio of 1:1 was shaped by gel-casting. The effects of solids loading and the content of dispersant on flow ability of nickel-titanium slurry and the mechanical properties of nickel-titanium sintered body were studied. The drying models under different solids loading were also discussed. The results show that the viscosity of slurries significantly increases with an increase in solids loading. After a proper process of drying, the green body with complex shape is obtained. The sintered body with porosity rate reaching up to 49.5 % and compression strength reaching to 364.74 MPa could meet the basic demands of implant materials.