空气反应钎焊ZrO_(2)与GH3536接头组织与力学性能  

Interfacial Microstructure and Mechanical Properties of Reactive Air Brazed Joints of ZrO_(2)Ceramic and GH3536

作　　者：杨钧皓 杨振文[1] 王颖[1] 宋奎晶[2] 王东坡[1] Yang Junhao;Yang Zhenwen;Wang Ying;Song Kuijing;Wang Dongpo(Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University,Tianjin 300350,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]天津大学天津市现代连接重点实验室,天津300350 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《稀有金属材料与工程》2021年第12期4450-4456,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51875400)。

摘　　要：采用Al_(2)O_(5)颗粒增强的Ag-CuO-Al_(2)O_(5)复合钎料,在钎焊温度为1050℃保温30 min工艺参数下,对ZrO_(2)陶瓷与GH3536合金进行了空气反应钎焊(RAB),分析了钎焊接头的界面结构及其形成机制;同时研究了接头在800℃氧化不同时间的组织演变规律及其对连接性能的影响。结果表明,钎焊过程中Al_(2)O_(5)颗粒分解产生Al_(2)O_(5)和TiO_(2),TiO_(2)与ZrO_(2)陶瓷反应生成ZrTiO_(4)相。GH3536侧金属元素发生氧化形成尖晶石层,并分别与钎缝中的Al_(2)O_(5)、CuO反应,在钎缝中生成细密分布的NiAl_(2)O_(5)相及紧邻尖晶石层的团块状NiCuO_(2)相。ZrO_(2)/GH3536接头高温800℃氧化1000 h后,钎缝中NiAl_(2)O_(5)呈团块状分布,Cr;O;薄层保持稳定;尖晶石层内部元素均匀化,厚度有明显增加。接头强度随着氧化时间的延长先降低后稳定在20 MPa以上。ZrO_(2)ceramic and GH3536 alloy were reactive air brazed(RAB)at 1050°C for 30 min with Ag-CuO-Al;TiO_(2)composite filler reinforced by Al;TiO_(2)particle.The interface structure and formation mechanism of the braz ed joint were analyzed.Meanwhile,the influences of the exposure test at 800°C on the microstructure and properties of joints were analyzed.The results show that Al;TiO_(2)particles are decomposed into Al_(2)O_(5)and TiO_(2)particles,and TiO_(2)reacts with ZrO_(2)ceramic to form the ZrTiO_(4)phase.The metal elements on the GH3536 side are oxidized to form spinel layer.The Ni oxide reacts with Al_(2)O_(5)and CuO in the brazing seam to form uniformly distributed NiAl_(2)O_(5)and massive NiCuO_(2)phase adjacent to the spinel layer,respectively.After the ZrO_(2)/GH3536 joint is oxidized at800°C(high temperature)for 1000 h,NiAl_(2)O_(5)in the brazing joint is distributed in blocks,while the thin layer of Cr;O;remains stable.The elements inside the spinel layer are homogenized,the thickness of which increases significantly.The strength of the joint first decreases and then stabilizes at above 20 MPa with the extension of oxidation time.

关 键 词：空气反应钎焊 ZrO_(2)陶瓷 GH3536合金 复合钎料 高温氧化 

分 类 号：TG454[金属学及工艺—焊接]