34results about How to "Good high temperature chemical stability" patented technology

The present invention is one kind of multilayer hard nanometer ZrO2/TiN coating and belongs to the field of ceramic coating technology. The multilayer hard nanometer ZrO2/TiN coating includes alternately deposited ZrO2 layers of 2-8 nm thickness and TiN layers of 0.4-1.2 nm thickness on the substrate of hard alloy, ceramic or metal, and has total thickness of 2-5 microns. It is prepared through a double-target sputtering process in argon atmosphere. It has not only excellent high temperature oxidation resistance, but also hardness as high as 19.1-23 GPa. The multilayer hard nanometer ZrO2/TiN coating of the present invention may be formed on high speed cutting tool and other high temperature wear and corrosion resistant workpieces.

The invention relates to a glass sealing material as well as preparation and use methods thereof. The glass sealing material comprises the following raw material components at a molar ratio: 0-10 of B2O3, 0-5 of Al2O3, 25-60 of SiO2, 10-25 of CaO, 10-25 of SrO and 5-25 of Ca2O3. According to the invention, a Ga element is added in the glass sealing material so as to form a non-proliferation layer, thus effectively reducing the proliferation of Cr ions in a Cr-containing stainless steel alloy connection pole toward the sealing glass and significantly improving the high temperature chemical stability of sealing microcrystal glass; preparation raw materials are simple and available, and process is stable; and a reverse glass network structure in which SiO2 is used as a main body is obtained,cost is low, and process is simple and practicable, thereby achieving the conditions of practicality and industrialization.

The invention discloses a TiN enhanced ferrous matrix composite surface layer and a processing method thereof. The processing method is characterized by precoating a layer of pure titanium powder on the surface of a steel matrix, adopting nitrogen arc for direct heating after drying to locally smelt the pure titanium powder and the surface of the steel matrix, Ti in a weld pool and N from the arc atmosphere undergoing nitridation reaction (Ti+N->TiN) and the in-situ TiN serving as an enhanced phase to form the ferrous matrix composite with the steel matrix. By adopting the treatment methods of titanium powder precoating and nitrogen arc cladding, the TiN enhanced ferrous matrix composite surface layer with thickness of 1-2mm is prepared on the surface of the steel matrix. The TiN enhanced phase grows in situ, is metallurgically bonded with the steel matrix, dendritical and granular and uniformly distributed in the steel matrix and can obviously improve the surface hardness and the wear resistance of the steel matrix.

The invention relates to a high temperature and high pressure direct synthesis method of cubic boron nitride in a titanium nitride plated coating, relating to a high temperature and high pressure synthesis method of an ultra-hard material. The method takes hexagonal boron nitride as a raw material, an alkali metal nitride or alkaline-earth metal nitride or boron nitride as a catalyst, and metallic titanium powder or a metallic titanium compound as an additive. The method comprises the following steps of: mixing the hexagonal boron nitride and the alkali metal nitride or the alkaline-earth metal nitride or the boron nitride according to a weight proportion of 1:(0.1-0.3), adding the metallic titanium powder or the metallic titanium compound accounting for 0.5wt%-10wt% of the total mixture, and synthesizing a cubic boron nitride product with the titanium nitride plated coating at a high temperature and a high pressure, wherein the synthesis temperature is 1000 to 1800 DEG C, the synthesis pressure is 4.0-6.0 GPa, and the temperature and the pressure last for 3-15 minutes. The cubic boron nitride provided by the invention has the characteristics of high hardness, good abrasion resistance, good high temperature resistance, good tenacity, thermal conduction and electrical conduction, and is particularly suitable for preparation of polycrystalline cubic boron nitride products and tools.

The invention relates to the technical field of thermal barrier coating materials, and particularly relates to a method for generating an A2B2O7 type thermal barrier coating material by a laser-induced high-temperature solid-phase reaction. The method comprises the following steps: (I) uniformly mixing an oxide AOx with an oxide BOy to obtain mixed powder; (II) uniformly distributing the mixed powder obtained in the step (I) to the surface of a substrate; and (III) irradiating the surface of the substrate obtained in the step (II) by laser, inducing the mixed powder to carry out a high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7, and growing the A2B2O7 on the surface of the substrate to generate the A2B2O7 type thermal barrier coating material, wherein the element A is a rare earth element, the element B is at least one selected from Ti, Zr and Hf, x is greater than or equal to 0.5 and less than or equal to 2, and y is equal to 2. The preparation method is simple to operate and convenient to control, production efficiency is high, production cost is low, pollution is small, the production period is short, and the method can be used for large-scale production.

The invention discloses a vacuum evaporation process of a high-brightness transparent light reflecting film. A plated plant base film is mounted in an evaporation chamber, then a cooling roller carries out low-temperature cooling, molybdenum boats where evaporation targets are arranged are put into an evaporation tank, it is guaranteed that the distance between each evaporation target and the bottom end of a center main drum is the same, after a cover plate is closed, the evaporation tank is fed into the evaporation chamber, and the evaporation chamber is vacuumized; the evaporation targets are heated to the melting point and are vaporized, the cover plate of the evaporation tank is opened, the plated plant base film is controlled to move in the evaporation chamber at a constant speed, andstep-by-step evaporation operation is carried out; and equipment is shut down after evaporation is completed. According to the vacuum evaporation process of the high-brightness transparent light reflecting film, the light reflecting brightness of the finally-obtained light reflecting film is far higher than that of a common transparent light reflecting film, a good light reflecting effect is achieved, the surface is light, thin and transparent, the vacuum evaporation process is suitable for later deep processing treatment, and meanwhile a metal film is firm and not prone to falling off.

The invention discloses a preparation method of a closed-pore ceramic microsphere filled gradient ceramic coating. The method comprises the following steps: taking an organic resin microsphere as a core, attaching a ceramic precursor on the surface of the core to obtain a solid microsphere, performing calcining at high temperature to obtain a hollow ceramic microsphere, and mixing the hollow ceramic microsphere with a ceramic aggregate to form a ceramic coating on the surface of a matrix. According to the invention, the ceramic microspheres of the mullite (3Al2O3.2SiO2) crystalline phase are used for constructing closed pore channels in the coating, and in the spraying process, the gaps among the hollow microspheres are filled with the ceramic aggregate with small particle size, so that the compactness of the coating is effectively improved, the formation of communicated pore channels is avoided, and the ceramic coating can have lower heat conductivity and provide a better heat insulation effect.

The invention relates to a preparation method of a mining reinforcement material, and belongs to the technical field of mining materials. The preparation method of the mining reinforcement material ischaracterized in that based on the flame retardance characteristic of ammonium polyphosphate, with diatomite as a carrier, a double-component ammonium polyphosphate-diatomite inorganic composite flame-retardant filler is prepared by an in-situ polymerization method, and an ammonium polyphosphate-diatomite/synergist composite flame-retardant filler is designed on the basis of the double-componentcomposite flame-retardant filler with magnesium hydroxide the synergist; with good smoke absorbing effect of the diatomite with high specific surface area and based on the special layered structure and composition and also flame retarding, smoke suppressing and acid resisting functions of magnesium hydroxide, the prepared mining reinforcement material is allowed to have good flame retarding and smoke suppressing properties; cellular glass cloth is used as a reinforcing agent for the mining reinforcement material, so that the strength of the mining reinforcement material is effectively improved; and according to the invention, a synergistic effect between two flame-retardant elements silicon and phosphorus causes a decrease in the number of brittle amorphous carbon layers generated and an improvement in the flame retardance of the mining reinforcement material.

The invention relates to a preparation method of an anti-permeation ceramic material capable of rapidly reacting with low-melting-point oxides, which comprises the following steps: weighing La2O3, RE2O3 and Nb2O5 powder with the purity of more than 99%, uniformly mixing the powder through a ball mill, and using alcohol as a ball milling medium to obtain slurry; drying the slurry, presintering at high temperature, and cooling to obtain initial powder; and grinding and sieving the initial powder, tabletting and sintering to obtain the impermeable LaRE2NbO7 ceramic material which has the porosity of 5-15% and can quickly react with the low-melting-point oxide. The niobate ceramic with certain porosity is prepared by utilizing a high-temperature solid-phase method, the contact area of the niobate ceramic and the low-melting-point oxide is enlarged, so that the reaction is accelerated, and a product with large volume, small density and excellent chemical stability is formed through the rapid reaction of the material and the low-melting-point oxide; pores are quickly blocked, so that low-melting-point oxide melt is effectively prevented from permeating into the material, and the ceramic material which can be used for a long time at high temperature is obtained.

Provided is a novel blanking column of a hot charging type energy-saving airtight submerged arc furnace. The novel blanking column is characterized by comprising a non-metallic blanking column body; the top of the non-metallic blanking column body is connected with a support connecting flange, and a heat-resisting metal reinforced grid is buried in the main body of the nonmetallic blanking column body. The novel blanking column has the characteristics of being resistant to oxidation and high temperature, long in service life, non-conducting, impermeable to magnetism and the like. The novel blanking column has the advantages of being small in thermal expansion coefficient, high in strength and hardness, resistant to erosion and oxidation, good in high-temperature chemical stability and the like, and meanwhile the non-metallic material is non-conducting, impermeable to magnetism, safe and reliable; certain difference exists between the linear expansion coefficient of the material of the heat-resisting metal reinforced grid and the linear expansion coefficient of the material of a cavity of the non-metallic blanking column body, and a high-temperature-resisting insulating coating separates the heat-resisting metal reinforced grid from the cavity of the non-metallic blanking column body so that heat stress generated by temperature variation can be reduced; meanwhile, the high-temperature-resisting insulating coating improves the insulating performance of the metal grid.