48results about How to "Strong resistance to high temperature oxidation" patented technology

The invention discloses a preparation method of an AlTiCrN / YN nano multilayer hard coating. The preparation method comprises the following steps: cleaning, heating, etching and cleaning, preparing a Ti or Cr adhesion layer and preparing an AlTiCrN / YN wear-resistant layer. According to the preparation method provided by the invention, a Ti or Cr bonding layer is deposited on a tool matrix by adopting an evaporation coating method, and AlTiCrN layers and YN layers are alternatively periodically deposited on the Ti or Cr bonding layer by adopting an intermediate frequency reaction magnetron sputtering technology, thus the prepared AlTiCrN / YN nano multilayer hard coating tissue is of a non-columnar crystal structure, is compact, and is small in grain, is firmly bound with a tool matrix; the coating has higher hardness and excellent high-temperature oxidization resistance performance, and is especially suitable for making a high-speed dry type cutting stainless steel, an iron-based high-temperature alloy, a high-strength structural steel and a wear-resistant cast steel tool. The AlTiCrN / YN nano multilayer hard coating is simple in coating process, easy to implement and more suitable for industrialized production.

The invention relates to the technical field of ceramic-metal composite materials, and provides a nickel-based metal oxide ceramic material inertia anode. The nickel-based metal oxide ceramic material inertia anode has a metal phase and a ceramic phase, the metal phase is composed of the principal component Ni and one to two elements of Cu, Co, Zn, Cr, Ag, Fe, Al, V and the like, and an oxide phase is composed of CaO and TiO2; and the inertia anode is prepared through the steps that oxide and metal powder are subject to common ball milling, press molding is carried out, protective atmosphere sintering is carried out, and machining is carried out. The nickel-based metal oxide ceramic material inertia anode has the beneficial effects that electrical conductivity is good, high-temperature oxidation resistance is high, fused salt chemistry corrosion resistance and electrochemistry corrosion resistance are high, the thermal shock resistance is good, and the price is relatively low. The inertia anode is used for an electrolysis process in a chloride fused salt system, can serve as a substitution of a carbon anode, and solves the problems of high consumption and high CO2 emission.

The invention belongs to the technical field of metal processing, and in particular relates to a hot-rolling preparation method of 1700MPa high-Cr-Si thin-gauge hot-formed steel. Aiming at the problems in the prior art that steel sheets for hot forming need to be added with cold rolling to be prepared, and coatings are required for hot forming, the present invention provides a low-cost 1700MPa high-Cr-Si alloyed coating-free hot-forming steel, and A hot-rolling preparation method for thin-gauge coating-free hot-formed steel with this composition is proposed. The hot forming steel of the invention has simple preparation process and low cost, and the produced hot forming steel has uniform microstructure, excellent mechanical properties and high temperature oxidation resistance.

The invention discloses a SiC f / SiC composite material surface anti-radiation anti-air oxidation composite coating and preparation method thereof, the composite coating comprises successively coating SiC f The inner coating and the outer coating formed on the surface of the SiC composite material, the main component of the inner coating is MoSi 2 , Si and Cr and contains C elements, and the outer coating is high-purity β-SiC. Made by brush coating + one CVD process. Composite coating provided by the present invention: on the one hand, the outer coating fully infiltrates the inner coating, and the coating structure is uniform and compact, and SiC f / SiC composite materials are well combined; on the other hand, the composite coating has excellent oxidation resistance, thermal shock resistance and radiation resistance, and the resulting SiC composite coating contains f / SiC composite material, the strength retention rate after oxidation at 1400 ° C for 10 h is greater than 92.20%, and the strength after 30 thermal cycles from 1400 ° C to room temperature is the same as that of pristine SiC f / SiC composite material has increased by more than 12.23%, and the ion energy is 6MeV Si 2+ The strength retention rate after irradiation is over 84.15%.

The invention relates to a titanium contained high chromel alloy and application thereof in spraying materials. The components of the alloy are (by weight percentage) as follows: the content of chromium is more than or equal to 15 percent and less than or equal to 25 percent, the content of titanium is more than or equal to 1 percent and less than or equal to 6 percent, the content of silicon is more than or equal to 1 percent and less than or equal to 6 percent, the content of carbon is more than or equal to 0 percent and less than or equal to 0.02 percent, the content of nickel is more thanor equal to 20 percent and less than or equal to 55 percent, the content of rhenium is more than or equal to 0.5 percent and less than or equal to 6 percent, the content of aluminum is more than or equal to 0 percent and less than or equal to 6 percent, the content of sulfur is more than or equal to 0 percent and less than or equal to 0.035 percent, he content of phosphorus is more than or equal to 0 percent and less than or equal to 0.035 percent, the content of manganese is more than or equal to 0 percent and less than or equal to 0.2 percent, and the rest is iron. After the parts of workingequipment are sprayed at high temperature oxidation and high temperature corrosion environments by the spraying material produced by the alloy, since the coating has good high temperature oxidation and vulcanization resistance and hot corrosion resistance performances, the service life of the parts can be greatly improved.

The invention relates to a novel thermal barrier coating preparation process, which comprises the following steps: forming a metal bonded underlayer on the surface of a substrate; forming an in-situ thermally grown oxide layer (TGO); and forming a ceramic heat-insulating surface layer. The TGO layer is pre-grown before the substrate is put into service. The composition of the TGO layer includes alpha-alumina. In the present invention, a layer of dense and continuous TGO layer mainly composed of α-alumina is preset through large-particle dry ice jet purification and roughening treatment and pre-vacuum argon oxidation treatment. The oxide film will have good resistance to high temperature oxidation, prevent rapid oxidation, reduce the growth rate of TGO layer thickness, and achieve the purpose of reducing the occurrence probability of thermal barrier coating peeling.