Nb-Si基超高温合金及其定向凝固工艺的研究进展

陈瑞润, 陈德志, 王琪, 王墅, 周哲丞, 丁宏升, 傅恒志

Research Progress on Nb-Si Base Ultrahigh Temperature Alloys and Directional Solidification Technology

CHEN Ruirun, CHEN Dezhi, WANG Qi, WANG Shu, ZHOU Zhecheng, DING Hongsheng, FU Hengzhi

表2 5种不同定向凝固方式的优缺点

Table 2 The advantages and disadvantages of five different directional solidification methods

Directional Advantage Disadvantage solidification method OFZ No crucible pollution; The requirement for The preparation pattern is too small; It is difficult vacuum is relatively low to control the growth rate accurately EBDS Restricted by its own gravity and surface tension; The sample is simple in shape and small in size; The prepared sample has no crucible pollution It needs high vacuum and elements are easy to volatilize IDS Convection at the solid-liquid interface is small; Impurity is introduced into the ceramic crucible; The fracture toughness is high at room The temperature gradient is small temperature C-DS It is protected by metal condensation shell; The melt decreases; The growth rate is difficult No crucible pollution to control ECCDS Large size ingot with no pollution; High There is lateral heat dissipation temperature gradient is prepared