3results about How to "Uniform densification" patented technology

This invention provides a high-parameter SiC / SiC ceramic matrix composite material, relating to the field of aerospace high-temperature structural materials. This high-parameter SiC / SiC ceramic matrix composite material is composed of a SiC fiber preform, an interface phase, and a SiC matrix; the interface phase is a BN layer or a PyC+BN composite gradient layer; the SiC fiber preform adopts a 3D orthogonal braided or needle-punched structure, with a fiber volume fraction of 45%–55%; the SiC matrix is ​​prepared by a CVI+PIP composite process, with a matrix porosity ≤5%. The preparation method includes four main steps: SiC fiber preform preparation, interface phase deposition, SiC matrix densification, and environmental barrier coating. By optimizing the preform braiding structure, interface phase type, and matrix composition, combined with specific preparation processes, the composite material meets the requirements of high mechanical properties, high high-temperature oxidation resistance, high density, and high thermal conductivity. This preparation method, through CVI+PIP composite process optimization, nano-dispersed phase addition, and gradient interface phase design, overcomes existing process bottlenecks and achieves the industrial-scale preparation of high-performance composite materials.

This invention discloses a method for preparing magnesium aluminum spinel using calcium aluminate filter residue from water treatment agents, belonging to the field of magnesium aluminum spinel synthesis technology. The method involves drying the calcium aluminate filter residue from water treatment agents and then calcining it at a low temperature of 400-800℃ to obtain an intermediate material. This intermediate material is then mixed with a magnesium source and rare earth oxides and ball-milled to obtain a mixed powder. The mixed powder is then pressed into pellets and sintered at a high temperature of 1400-1700℃ to obtain magnesium aluminum spinel. This method uses calcium aluminate filter residue from industrial solid waste water treatment agents as the main raw material, fully utilizing its raw material characteristics to prepare a high-purity, high-density magnesium aluminum spinel product, achieving high-value utilization of waste. Furthermore, this method is simple to operate, low-cost, and easy for industrial production.

The application discloses a kind of high-temperature-resistant fiber composite material and preparation process thereof, belong to new material technical field.The application will aluminium salt, zirconium salt, complexing agent of zirconium salt, magnesium chloride hexahydrate and tetraethyl orthosilicate, PVP and PEO are added in water, after mixing, pH is adjusted to 3.5-4.5, obtain spinning precursor sol, the aluminium salt is aluminium chloride hexahydrate, the zirconium salt is at least one of zirconium oxychloride and zirconium nitrate, the sol is drawn and formed to obtain first fiber, the first fiber is dried and is calcined at low temperature, medium temperature and high temperature.Compared with prior art, the application can more uniformly densify composite fiber, guarantee the mechanical properties of composite fiber.