【摘要】 采用真空离心铸造 +机加工工艺制备的TiAl基合金排气门在 483Q柴油发动机台架上进行了 48h耐久性试验。结果表明 :TiAl基合金排气门质量轻 ,约为 2 1 4材料排气门质量的 50 % ;TiAl基合金排气门与原气门座组成的摩擦副具有更好的磨合性和耐磨性 ,并且实际接触面积由原来的 30 %提高到 70 % ,相对下沉量由 8.0×1 0 - 3 m降低至 1 .0× 1 0 - 3 m ,说明TiAl基合金排气门可满足高性能发动机的服役要求。更多还原

【Abstract】 The technology development process, benefits and design requirements of TiAl-based alloy exhaust valves, of 483Q diesel engine were studied. The primary results in engine testing show that the contact area between valves and sitting increases from 30% to 70%,and the sink quantity decreases from 8.0×10~-3*!m to 1.0×10~-3*!m. The requirements of practical engine properties of the TiAl-based exhaust valves manufactured can meet the requirements for practical engine application.更多还原