摘要
Ta_(0.8)Hf_(0.2)C具有良好的热防护性能,适合在高温烧蚀环境中使用,MoSi_(2)是一种优异的烧结助剂且常用于抗烧蚀涂层中。为了研究MoSi_(2)含量对Ta_(0.8)Hf_(0.2)C-SiC-MoSi_(2)涂层抗烧蚀性能的影响,本研究采用料浆刷涂法在含有SiC过渡涂层的C/C复合材料上制备了不同MoSi_(2)含量的Ta_(0.8)Hf_(0.2)C-SiC-MoSi_(2)涂层,并研究了不同涂层的相组成、微观形貌和烧蚀行为。结果表明,当MoSi_(2)质量分数为10%时,涂层的质量烧蚀率和线烧蚀率分别为1.24 mg·s^(-1)、0.02μm·s^(-1),表现出较好的抗烧蚀性能。这是因为涂层中MoSi_(2)的存在抑制了SiC的主动氧化,减少了SiC的消耗,在烧蚀过程中形成的液相层黏度较高,抵抗高温火焰的冲蚀的能力较强,有效地阻止了氧的扩散。
Ta_(0.8)Hf_(0.2)C exhibits excellent thermal protection properties,making it well-suited for high-temperature ablation environments.MoSi_(2),an outstanding sintering agent,is frequently employed in anti-ablation coatings.To investigate the impact of MoSi_(2)content on the ablative performance of Ta_(0.8)Hf_(0.2)C-SiC-MoSi_(2)coatings,we employ the slurry-sintering method to prepare coatings with varying MoSi_(2)concentrations on C/C composites,which are pre-coated with SiC transition layers.We conduct a comprehensive analysis of the phase composition,micromorphology,and ablation behavior of these coatings.The findings reveal that,at a MoSi_(2)content of 10%(mass fraction),the coating exhibits optimal ablative properties,with a mass ablation rate of 1.24 mg·s^(-1)and a line ablation rate of 0.02μm·s^(-1).This superior performance is attributed to MoSi_(2)ability to hinder the active oxidation of SiC,thereby reducing its consumption.Additionally,the high-viscosity liquid layer formed during ablation effectively resists the erosion of high-temperature flames,further preventing the diffusion of oxygen.
作者
刘莹
李红
姚彧敏
杨敏
陶银萍
任慕苏
孙晋良
LIU Ying;LI Hong;YAO Yumin;YANG Min;TAO Yinping;REN Musu;SUN Jinliang(Research Center of Composite Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《材料工程》
北大核心
2025年第6期235-243,共9页
Journal of Materials Engineering
基金
上海市教育发展基金会和上海市教育委员会“曙光计划”项目(18SG34)。
