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首页> 外文期刊>Applied Surface Science >Texture structure and ablation behavior of TaC coating on carbon/carbon composites
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Texture structure and ablation behavior of TaC coating on carbon/carbon composites

机译：碳/碳复合材料上TaC涂层的织构和烧蚀行为

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摘要

TaC coatings with hybrid, (200) and (220) texture structure were prepared on carbon/carbon (C/C) composites by isothermal chemical vapor deposition with TaCl_5-Ar-C_3H_6 system. The residual stress, hardness and ablation behaviors of the different coatings were characterized by Raman spectra, nano-indentation and oxyacetylene flame ablation machine respectively. Results shown tensile stress exists in the TaC coatings and increases when texture orientation turns from hybrid to (220) and (200), while nano-indentation hardness of the coatings also obeys the same trend. The deposited coatings could improve the ablation-resistance properties of C/C composites effectively. The texture structure also had great effects on the ablation properties and ablation morphologies of the coatings. The mass ablation rate obviously decreases when the texture structure changes from hybrid orientation to (200) and (220) orientations. The hybrid orientation and (200) texture coatings exhibit coarse oxide morphologies with crater or some breakage existed; while the (220) texture coating shows dense, molten oxide morphology. The main ablation behaviors of the hybrid, (200) and (220) texture TaC coatings are oxidation and particle denudation and block denudation, oxidation and block denudation, oxidation and mechanical erosion and block denudation, respectively.
机译：通过TaCl_5-Ar-C_3H_6等温化学气相沉积法在碳/碳（C / C）复合材料上制备了具有杂化，（200）和（220）织构结构的TaC涂层。通过拉曼光谱，纳米压痕和氧乙炔火焰烧蚀机分别表征了不同涂层的残余应力，硬度和烧蚀行为。结果表明，拉伸应力存在于TaC涂层中，并且当织构取向从混合转变为（220）和（200）时，拉伸应力会增加，而涂层的纳米压痕硬度也遵循相同的趋势。沉积的涂层可以有效地改善C / C复合材料的抗烧蚀性能。织构结构对涂层的烧蚀性能和烧蚀形态也有很大的影响。当纹理结构从混合方向变为（200）和（220）方向时，质量烧蚀率明显降低。杂化取向涂层和（200）织构涂层表现出粗糙的氧化物形态，并具有缩孔或存在一些破裂； （220）纹理涂层显示出致密的熔融氧化物形态。杂化，（200）和（220）纹理TaC涂层的主要烧蚀行为分别是氧化和颗粒剥蚀和块体剥蚀，氧化和块体剥蚀，氧化和机械侵蚀和块体剥蚀。

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