Preparation method of high-temperature-resistant lightweight ceramic heat screen

Abstract

The invention discloses a preparation method of a high-temperature-resistant lightweight ceramic heat screen. The method comprises the following steps: a, preparing a colloidal ceramic modifier of glass fiber cloth; b, immersing glass fiber cloth into the colloidal ceramic modifier, taking out the glass fiber cloth, and baking and pre-curing the glass fiber cloth at 100-110 DEG C to obtain modified pre-impregnated cloth of the glass fiber cloth; c, the modified prepreg is wound and formed on a mold of a winding machine in a multi-layer mode, then demolding is conducted, and a primary cylindrical profile is obtained; d, putting a product obtained in the step c into a heating furnace, sealing, and then pressurizing into the heating furnace to obtain a cured cylindrical profile; and e, putting the product obtained in the step d into a high-temperature furnace, heating to 1500-1800 DEG C, preserving heat for 4 hours, cooling along with the furnace, cooling to 150-250 DEG C, and discharging to obtain the high-temperature-resistant light ceramic heat insulation screen.

Description

Technical field: [0001] The invention relates to the field of high temperature resistant materials, in particular to a method for preparing a high temperature resistant lightweight ceramic heat shield. Background technique: [0002] With the implementation of the national policy of developing new energy solar photovoltaic power generation, the photovoltaic power generation material single (poly) silicon material industry has developed rapidly, and the demand for C / C thermal field structural parts has increased significantly. The heat shield is an important thermal field for single crystal furnaces. Structural parts are in great demand. It is made of carbon fiber and prepared by chemical vapor deposition (CVD). However, with the development of large-scale single crystal furnaces and continuous crystal pulling technology (single crystal pulling time is greater than 240 hours), new and higher requirements are put forward for the performance of the heat shield and its preparatio...

AI Technical Summary

Problems solved by technology

However, with the development of large-scale single crystal furnaces and continuous crystal pulling technology (single crystal pulling time is greater than 240 hours), new and higher requirements are put forward for the performance of the heat shield and its preparation technology. The C / C thermal field structural parts prepared by the advanced CVD method can no longer meet the current needs

At the same time, there are still some defects in the existing C / C thermal field structural parts. One is that it is difficult to prepare large-scale thin-walled cylindrical structural parts by the prefabricated body CVD method; At high temperature, it is easy to deform, has poor corrosion resistance, is easy to pulverize, and has a low final service life; thirdly, there are currently 30,000 to 50,000 single crystal furnaces in my country and the installed C / C heat insulation The number of screens is 90,000 to 150,000. Such a large quantity requires 3,000 to 5,000 tons of carbon fiber. For example, the service life of C / C heat shields is reduced, and the amount of renewal is also very large. At the same time, the price of carbon fibers is high, and domestic resources are in short supply. It has an important impact on the development of C / C thermal field structural parts in the photovoltaic industry and the wide application of C / C composite materials

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