Ta_0.8Hf_0.2C具有良好的热防护性能，适合在高温烧蚀环境中使用，MoSi₂是一种优异的烧结助剂且常用于抗烧蚀涂层中。为了研究MoSi₂含量对Ta_0.8Hf_0.2C-SiC-MoSi₂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MoSi₂含量的Ta_0.8Hf_0.2C-SiC-MoSi₂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MoSi₂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、0.02 μm·s^-1，表现出较好的抗烧蚀性能。这是因为涂层中MoSi₂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_0.8Hf_0.2C exhibits excellent thermal protection properties， making it well-suited for high-temperature ablation environments. MoSi₂， an outstanding sintering agent， is frequently employed in anti-ablation coatings. To investigate the impact of MoSi₂ content on the ablative performance of Ta_0.8Hf_0.2C-SiC-MoSi₂ coatings， we employ the slurry-sintering method to prepare coatings with varying MoSi₂ 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 MoSi₂ 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 0.02 μm·s^-1. This superior performance is attributed to MoSi₂ 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.