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Joining of ZrB_2-based ultra-high-temperature ceramic composites using Pd-based braze alloys

机译:钯基钎料与ZrB_2基超高温陶瓷复合材料的连接

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摘要

Hot-pressed ZrB_2-SiC and composites with carbon (ZSC) or SCS-9a SiC fibers (ZSS) were joined using Pd-base brazes, Palco (65 percent Pd-35 percent Co) and Palni (60 percent Pd-40 percent Ni). Joint integrity was exhibited by the defect-free ZS/Palco/ZS joints with large interaction zones. The ZSS/Palco and ZSC/Palco joints revealed substantial chemical interaction and interfacial cracking due to residual stresses. The joints with Palni exhibited either poor wetting/bonding or cracking. The ZS/Palco joints displayed high Knoop hardness within the ZS region and lower hardness within the Palco interlayer.
机译:使用Pd基钎料,Palco(65%Pd-35%Co)和Palni(60%Pd-40%Ni)将热压ZrB_2-SiC以及含碳的复合材料(ZSC)或SCS-9a SiC纤维(ZSS)连接在一起)。具有大相互作用区域的无缺陷ZS / Palco / ZS接头具有良好的接头完整性。 ZSS / Palco和ZSC / Palco接头由于残余应力而显示出大量的化学相互作用和界面开裂。帕尔尼接头的润湿性/粘结性或开裂性均较差。 ZS / Palco接头在ZS区域显示出较高的努氏硬度,而在Palco夹层内部显示出较低的硬度。

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