6results about How to "Improve high temperature thermal stability" patented technology

The invention discloses a preparation method of a VOCs oxidation catalyst, precious metal is dispersed in heteropolyacid through a self-propagating method, the activity of the precious metal is improved, and meanwhile, the cage-shaped structure of the heteropolyacid can be used as a supporting framework of the precious metal to improve the overall mechanical strength and stability of the catalyst; then the obtained powder catalyst and a second carrier are prepared into coating slurry together, cordierite is coated with the coating slurry through dipping, the coating is modified after drying, and therefore the competitive adsorption effect of water vapor on reaction gas on active sites is reduced, and the catalyst can be suitable for the VOCs treatment process with the high water content and the low operating temperature.

The present invention provides a biochar-based catalyst and a preparation method thereof and an application thereof in removing volatile organic compounds, and relates to the technical field of organic pollutant removal. The present invention uses rare earth metal oxides as an auxiliary agent to wrap porous biochar, and forms a rare earth metal oxide hydrophobic coating on the surface of the porous biochar, which greatly improves the high thermal stability of the biochar-based catalyst and the water resistance in a high-humidity environment and the sulfur resistance in a high-sulfur environment. By loading a variety of transition metals as active components, the catalytic activity of the biochar-based catalyst is improved. The catalyst provided by the present invention not only meets the applicable scope of traditional carbon-based catalysts, but also can meet the catalytic oxidation of VOCs such as toluene in a wide temperature range and high-humidity environment to harmless CO2 and H2O. The applicable temperature can be increased to 400°C, and it is applicable to a high-humidity environment with a water content of 8%, and has a wider application prospect.

The invention provides a TiAlN / MAX-phase multi-layer composite coating as well as a preparation method and application thereof, and relates to the technical field of functional coating materials. The coating adopts a nano alternating multilayer structure of the TiAlN layer and the MAX phase layer, so that the bottleneck that hardness and toughness of a traditional coating are difficult to consider at the same time is solved, and the comprehensive mechanical property and the failure resistance of the coating are remarkably improved; and under the high-temperature working condition, high-activity Al in the MAX phase generates a continuous and compact Al2O3 protective film with a stable structure in situ, so that the dynamic self-repairing and melting loss resisting functions are realized, and the service life of a part is greatly prolonged. The coating has excellent thermal conductivity and stress relaxation capability, and has outstanding thermal shock resistance and high-temperature stability. The preparation method can accurately regulate and control the structure parameters and the interface bonding state of each layer, the process is stable, and industrial production is facilitated. The coating is applied to metal parts such as aluminum / magnesium alloy die-casting dies, and is high in practicability and wide in application prospect.

This invention discloses a three-dimensional continuous reinforced phase reinforced copper matrix composite material and its applications. The composite material comprises a three-dimensional continuous porous framework composed of reinforcing phases and a copper matrix phase filling the pores of the framework. The reinforcing phases are interconnected in three-dimensional space to form a continuous network, and the copper matrix phase is continuously distributed in three-dimensional space and fills the pores of the framework. The two phases are interpenetrating, forming a double-continuous three-dimensional network structure. The composite material exhibits good dimensional stability and mechanical properties, making it particularly suitable for applications requiring high heat flux and frequent thermal cycling, such as nuclear fusion divertors.

The application provides a silicon carbide high-temperature ohmic contact electrode and a preparation method thereof, and belongs to the technical field of silicon carbide device manufacturing; the technical problem to be solved is that the existing high-temperature SiC ohmic contact electrode has large interface stress, is easy to diffuse and peel off, and has poor high-temperature stability; the technical scheme for solving the technical problem is that the electrode comprises a substrate, a Ti adhesion layer is deposited on the surface of the substrate, a Ti:W continuous gradient transition layer is deposited on the surface of the Ti adhesion layer, a W barrier layer is deposited on the surface of the Ti:W continuous gradient transition layer, and a Pt electrode layer is deposited on the surface of the W barrier layer; the application is applied to the fields of aerospace, oil exploration, new energy vehicles, smart grids and the like.

This invention provides a heat-resistant, migration-resistant, and moisture-adhesive starch-based material. By weight, the starch-based material comprises the following components: 60-85 parts natural starch, 3-8 parts composite crosslinking agent, 5-12 parts heat-resistant modified filler, 8-15 parts low-migration composite plasticizer, 2-6 parts moisture-adhesive functional regulator, 0.5-2 parts coupling agent, 0.3-1.5 parts antioxidant stabilizer, and 30-60 parts deionized water. This invention also provides a preparation method and application of the starch-based material. Through oxidative crosslinking composite modification, functional additive compounding, and three-dimensional network structure reconstruction technology, this invention constructs a dense and stable crosslinked network, effectively inhibiting the migration and precipitation of small molecule additives, significantly improving the material's high-temperature thermal stability and resistance to moisture-heat aging, while simultaneously endowing the material with durable and controllable moisture adhesion properties. The preparation process of this invention is simple, the raw materials are inexpensive and readily available, and the material is green and biodegradable. The resulting material can be widely used in food packaging, composite adhesives, medical bonding materials, daily-use moisture-adhesive products, and biodegradable coatings.