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首页> 外文期刊>Journal of Materials Engineering and Performance >Active Brazing of SiC-Base Ceramics to High-Temperature Alloys
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Active Brazing of SiC-Base Ceramics to High-Temperature Alloys

机译：将SiC基陶瓷的活跃钎焊在高温合金中

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摘要

Active metal brazing of SiC-base ceramics and composites to Ti, Cu-clad-Mo, and nickel was carried out to screen promising commercial braze compositions with liquidus temperatures of 810-1040 degrees C. Microstructure, elemental composition, and microhardness were characterized using FESEM, EDS, and Knoop test in joints brazed using Ag-Cu-Ti alloys (Cusil-ABA and Ticusil) and a Ni-base alloy (MBF-20). Ti- and Si-rich interfacial layers developed in joints brazed using Ti-containing brazes, whereas Ni- and Si-rich layers formed in joints brazed using Ni-base brazes. Monolithic SiC/Mo and SiC/Kovar joints with Cusil-ABA had sound interfaces and compressive shear strengths of 25-30 MPa. In the case of composites, surface preparation influenced bond quality: ground SiC-SiC samples led to sound joints and unground samples led to interfacial decohesion at low thermal strains whereas joints cracked regardless of the surface preparation at large thermal strains. Among SiC-SiC/metal joints, SiC-SiC/Cu-clad-Mo had the best microstructure and bond quality. Microstructures of joints made using MBF-20 mixed with low-expansion Si-X (X: Y, Ta, Hf, Ti, B) eutectic powders to control the thermal expansion are also presented.
机译：对Ti，Cu-Clad-Mo和镍的活性金属钎焊和复合材料进行了筛选的有前途的商业钎焊组合物，其具有810-1040℃的液相液的温度。微观结构，元素组合物和微硬度进行了使用Ag-Cu-Ti合金（Cusil-ABA和TiCusIL）和Ni-基合金（MBF-20）钎焊的关节中的FeEM，EDS和Knoop试验。在使用含Ti钎焊的关节中开发的Ti和Si的富界面层，而在使用Ni-Base钎焊的关节中形成Ni-和Si的层。具有Cusil-ABA的单片SiC / Mo和SiC / Kovar接头具有25-30MPa的声音界面和压缩剪切强度。在复合材料的情况下，表面制备影响键合质量：磨削的SiC-SiC样本导致声音接头和未在低温菌株下导致的界面脱粘，而无论在大热菌株下的表面制备如何裂纹。在SiC-SiC /金属接头中，SiC-SiC / Cu-Clad-Mo具有最佳的微观结构和粘合质量。还介绍了使用MBF-20与低膨胀Si-X（X：Y，Ta，HF，Ti，B）共晶粉末进行控制的微观结构，以控制热膨胀。

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