Heat-proof ring and preparation method thereof

The invention discloses a preparation method of a heat-proof ring. The preparation method comprises the following steps: weaving a carbon fiber fabric according to the shape and size of the heat-proof ring; cyclically compounding the carbon fiber fabric with the first silica sol to obtain a preform; the solid content of the first silica sol is 23%-50%, and the volume fraction of the carbon fiber fabric in the heat-proof ring is 10%-30%. The invention further discloses the heat-proof ring, the carbon fiber fabric is woven by imitating the shape and size of the heat-proof ring, and the heat-proof ring is obtained through composite forming. And the uniformity and consistency of the quartz matrix in the heat-proof ring are improved, the temperature and pressure of hot pressing treatment are reduced, the crystallization phenomenon is avoided, and the heat-proof performance and the mechanical performance of the heat-proof ring are improved. 本发明公开了一种防热环的制备方法，包括如下步骤：仿照防热环的形状和尺寸编织碳纤维织物；将碳纤维织物循环复合第一硅溶胶得到预制体；将预制体进行热压处理，