目的 实现有机硅树脂的室温固化并提高其耐热性，从而制备室温固化耐高温涂层。方法 以硅羟基为活性官能团的有机硅树脂作为主体树脂，选择自制的聚硅氮烷作为固化剂，添加碳化硅和玻璃粉等耐热颜填料，制备一种室温固化的有机硅/聚硅氮烷耐高温涂料。采用红外光谱扫描仪和热失重分析仪分别对树脂的固化过程和耐热性能进行表征。加入填料后，对固化后涂层的铅笔硬度、抗冲击性、柔韧性和耐高温性能进行评价。采用金相显微镜对热处理后的涂层形貌进行观察。结果 硅树脂和聚硅氮烷在室温下混合反应72 h后，涂覆层硬化成膜，其红外谱图中N—H的弯曲振动峰消失，归属于Si—N的吸收峰强度呈减弱趋势，证明了二者之间发生了化学反应。随着聚硅氮烷加入量的增加，样品热失重率减小且残重增加，其中加入32.5%聚硅氮烷的固化物样品，400 ℃的失重率仅为0.76%，失重5%时的温度高达500 ℃以上。固化后涂层的附着力为0级，柔韧性为1级。热处理后，涂层表面的平整度变好，附着力明显提高。结论 聚硅氮烷不仅能常温固化硅树脂，改善其附着力，而且明显提高了有机硅树脂的耐热性。基于聚硅氮烷固化有机硅树脂制备的涂层具有良好的柔韧性和耐高温特性，最高耐温达到400 ℃以上。

The work aims to achieve room-temperature curing of organic silicone resin and improve its high-temperature resistance and then prepare the room-temperature curing and high temperature resistant coating. The organic silicone resin with silicon hydroxyl as active functional group was used as the main resin, and the self-made polysilazane was adopted as the curing agent. Then heat-resistant pigments and fillers like SiC and glass powder were added to prepare a room-temperature curing and high temperature resistant organic silicone/ polysilazane coating. The curing process and heat-resistant property of resin were respectively characterized by infrared spectroscopy (IR) and thermo gravimetric analysis (TGA). Pencil hardness, and impact and high-temperature resistance were evaluated for the cured coatings added with fillers. The morphology of the coating after heat treatment was observed by metallographic microscope. The coating layer hardened into film after silicone resin and polysilazane mixed and reacted with each other for 72 h at room temperature. The N—H bending band in IR spectra disappeared and the intensity of absorption peak belonging to Si—N band decreased, so silicone resin and polysilazane reacted.. As the addition amount of polysilazane increased, thermal weight loss of samples decreased but residual weight added. When 32.5% cured samples of polysilazane were added, the weight loss at 400 ℃ was only 0.76% and the temperature for weight loss of 5% reached over 500 ℃. The adhesion of the cured coating was 0, and the toughness was level 1. After heat treatment, the surface roughness of the coating became better and the adhesion was significantly improved. Polysilazane can cure silicone resin at room temperature, improve the adhesion and increase heat resistance. The coating prepared by organic silicone resin cured by polysilazane has outstanding flexibility and high-temperature resistance for the maximum temperature over 400 ℃.