Method for preparing silicon carbide woodceramics

Abstract

The invention discloses a method for preparing silicon carbide woodceramics, which uses a slip casting method for preparing carbon slurry into carbon billets and then adopts a method of liquid phase siliconizing or gas phase siliconizing to lead the carbon billets and the carbon to form the silicon carbide woodceramics. The carbon slurry contains wooden carbon powder with fineness of 1500 meshes to 10000 meshes and water. The mass ratio of the carbon powder to the water in the carbon slurry is 5: (4-7.5), and the carbon slurry also contains a dispersant and a binding agent; the mass ratio of the dispersant to the wooden carbon powder is 1:(33-300); and the mass ratio of the binding agent to the wooden carbon powder is 1: (120-1000). The method for preparing the silicon carbide woodceramics has cheap and easy-available raw materials, simple and feasible technique and reliable material performance, and can be applied to the industrial production in batches.

Description

technical field [0001] The present invention relates to a method for preparing silicon carbide wood ceramics. Background technique [0002] The original intention of wood ceramics research is an attempt to deal with and effectively recycle wood waste under the background of increasingly prominent environmental problems. In the early 1990s, Dr. Toshihiro Okabe of Japan's Aomori Craft Experimental Field first carried out research work in this area using wood waste (such as waste paper, wood chips, etc.) as raw materials, and the corresponding products were called "woodceramics". )". For more than ten years, researchers from many countries have conducted research in this area, and American scholars call it "Eco-ceramics". [0003] In recent years, wood ceramics has become a hot spot in the research of new ceramic materials. Many domestic and foreign researchers have used different wood materials and process routes to study and prepare wood ceramics and their composite materi...

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Problems solved by technology

[0004] However, the above method cannot become a silicon carbide wood ceramics preparation process with practical application value: when directly using wood to prepare silicon carbide wood ceramics, due to the low density of wood and large structural fluctuations, the prepared ceramics have low density and poor mechanical properties. Ideal and poor reliability; when the density board is used as the raw material, the structural uniformity is improved, but the green body density is still low, and the prepared ceramics have poor compactness and low strength; when the resin-based composite material is used as the raw material, higher density can be obtained Silicon carbide wood ceramics, but the resin powder introduced in the raw material system makes the residual carbon in the ceramics too high, which limits the further improvement of its mechanical properties