Si-Mo-Zr反應(yīng)熔滲改性C/C復(fù)合材料的微觀結(jié)構(gòu)與燒蝕性能

Si-Mo-Zr反應(yīng)熔滲改性C/C復(fù)合材料的微觀結(jié)構(gòu)與燒蝕性能Microstructure and ablation properties of Si-Mo-Zr modified C/C composites by reactive melt infiltration

為了提高C/C復(fù)合材料的抗燒蝕能力，采用不同配比的Si-Mo-Zr混合粉末反應(yīng)熔滲改性C/C復(fù)合材料。利用X射線衍射分析儀(XRD)、掃描電鏡(SEM)和透射電鏡(TEM)分析改性C/C復(fù)合材料的物相組成和微觀結(jié)構(gòu)。利用氧乙炔焰燒蝕儀檢測(cè)分析樣品的燒蝕性能。結(jié)果表明：當(dāng)混合粉末的成分配比為n(Si):n(Mo):n(Zr)=10:1:4時(shí)，樣品熔滲效果最佳，密度和孔隙率分別為2.66 g/cm3和8.1%。熔滲效果較差的樣品僅在靠近樣品表面有SiC和ZrC陶瓷相共存的區(qū)域，樣品內(nèi)部?jī)H含有少量SiC；熔滲較好的樣品可以在樣品內(nèi)部觀察到SiMoZrC固溶相以及環(huán)狀ZrC相。熔滲效果較差的樣品由于內(nèi)部陶瓷相含量較少，其燒蝕性能隨著燒蝕時(shí)間從300 s提高到600 s而急劇下降。

In order to improve the ablation resistance of C/C composites, C/C composites were modified by Si-Mo-Zr mixed powder with different chemical compositions by reactive melt infiltration. X-ray diffractometry(XRD), scanning electronic microscopy(SEM) and transmission electron microscopy(TEM) were used to analyze the phase composition and microstructure of the modified C/C composites. The results show that infiltrated composite have the best infiltration effect when the chemical composition of the mixed powder is n(Si):n(Mo):n(Zr)=10:1:4, whose density and porosity are 2.66 g/cm3 and 8.1%, respectively. The regions with ZrC and SiC ceramics can be only observed around the surface of the samples with worse infiltration effect while only SiC can be observed inside of them. However, for the samples with better infiltration effect, SiMoZrC solid solutions and ringlike ZrC can be observed inside the samples. The ablation properties of the samples with worse infiltration effect decrease when the ablation time increases from 300 s to 600 s due to their limited ceramics phases inside.

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