镍基高温合金多孔发汗材料的制备工艺研究

Research on Preparation Process of Nickel-Based Superalloy Porous Sweating Materials

针对高超声速武器发动机对耐高温金属多孔发汗冷却材料的需求,本文以镍基高温合金为研究对象,通过粉末粒度选型、成形和烧结工艺的综合调控,制备出了孔结构均匀的多孔发汗材料,并对其性能进行分析。结果表明,制备的多孔发汗材料最大孔径<21.3μm,抗拉强度>225 MPa,孔隙率>25%;通过原料及制备工艺的调控,可实现发汗冷却材料的渗透率在10^(-13)~10^(-12)m^(2)范围内的有效控制;对多孔发汗材料的拉伸数据及断口形貌进行分析与表征,并证实其断裂方式为韧性断裂。

In response to the demand for high-temperature resistant porous metal sweating cooling materials for hypersonic weapon engines,the study focuses on nickel based high-temperature alloys.Through comprehensive control of powder particle size selection,forming,and sintering processes,a porous sweating material with uniform pore structure was prepared,and its performance was analyzed.The results show that the maximum pore size of the prepared porous sweating material is less than 21.3μm.Tensile strength greater than 225 MPa,porosity greater than 25%;By controlling powder particle size,pressing,and sintering processes,effective control of the permeability of sweating cooling materials can be achieved within the range of 10^(–13)–10^(–12) m^(2);Analyze and characterize the tensile data and fracture morphology of porous sweating materials,and confirm that their fracture mode is ductile fracture.