A preparation method of nano-silica/nitrogen-doped modified fiber composite material

Abstract

A preparation method of nano-silica / nitrogen-doped modified fiber composite material, which uses low-cost ceramic powder waste as a matrix material and supplemented with a dual-phase fiber body as a reinforcement, and the source of raw materials is cheaper and environmentally friendly It meets the requirements of green industrialization and indirectly relieves the pressure on environmental governance. According to the structural characteristics of the three-dimensional fiber body, the present invention creates a composite method of "two-phase complementarity". By introducing low-cost reagents such as cinnamic amide and ethylene glycol monomethyl ether, the surface of the fiber and the precursor solution are modified and filled to improve the The interfacial bonding force and dispersion performance between different fibers have been improved, and the lamination and compounding of aluminum silicate fiber cloth with high melting point and good high temperature resistance have been realized, which has effectively avoided the single mechanical defect of two-dimensional fiber cloth, and constructed a fabric with A three-dimensional fiber composite system of "dual-phase fiber-resin-cheap matrix" with excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a preparation method of a nano-silica / nitrogen-doped modified fibrous composite material. Background technique [0002] Since the 1980s, Europe, the United States, Japan and other countries have invested a lot of manpower and material resources to carry out research on the application of high temperature oxide / oxide ceramic matrix composites. Most of the high-temperature oxide / oxide ceramic matrix composites use polycrystalline oxide fibers as reinforcements, which are roughly classified into aluminum silicate and mullite fibers. The strong bonding reaction between the multiphase interfaces reduces the mechanical properties of the material. Due to the stable oxide layer on the surface of the oxide fiber as a package and protection, its heat resistance and oxidation resistance at high temperatures are more excellent [Wu Qing] .Imaging the interphase of carbon fiber composites...

AI Technical Summary

Problems solved by technology

[0003] At present, high-temperature oxide / oxide ceramic matrix composites are mostly produced by the Sol-Gel method, and the production technology already has the ability to form one-dimensional textile threads, two-dimensional fiber cloth and three-dimensional complex shape fiber bodies, but the Sol-Gel method has The production cost is high and the preparation cycle is long, so the price of commercial high-performance fibers in the market is also high

The current ceramic matrix composites have not achieved low-cost control of the material structure, and the production mode is mainly based on the traditional ceramic production mode. The current research focuses on the heating system, the type of ceramic powder, the length of the fiber, In terms of fiber types and other factors, it is difficult to achieve a major technological breakthrough in a short period of time [Chen wen.Dynamic Mechanical and Thermal Properties of Cross-linked Fiber Composites[J].Journal of Wuhan University of Technology,2010,25(05):780- 784.]

[0004] In the past ten years, scientific researchers have tried to realize the preparation of O / OCMC fibers through various methods such as hydrosolvothermal method, spray pyrolysis method and electrospinning method, and have made certain progress in technology, but it is far from the mass production. There is still a large technical gap in low-cost production. How to improve the grain refinement process, design a stable multi-component phase structure, and achieve a uniform distribution of polycrystalline components in the fiber are currently technical difficulties that need to be overcome.

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