35results about How to "Reduced oxidative weight gain" patented technology

The invention discloses a rare-earth oxide modified chromizing coating and its preparation method and uses. Modified chromizing coating constituent is made up of infiltrated chrome, composite deposit metal M and minim rare-earth oxide rare-earth oxide Re#-[x]O#-[y]is Re=Ce, Y, La etc. According to mass percent, chrome content of chromizing coating surface layer is 35-55 portion, and others are M and minim rare-earth oxide, in which M coming from M-Re#-[x]O#-[y] composite deposit. The process is as follows: using metal Ni, Fe , Co, carbon steel or low-alloy steel as base material, making M-Re#-[x]O#-[y] composite deposit on base material using composite electric plating method, diffusing for chromizing, getting rare-earth oxide modified chromizing coating. The invention has a simple and mature process. and coating can physically grow protective compact Cr#-[2]O#-[3]oxidation film under high temperature, which is intensively adhesive to coating base body. Coating have good oxidation and corrosion resistance.

The invention provides heat-resisting and wear-resisting alloy steel. The heat-resisting and wear-resisting alloy steel is prepared from, by weight, 0.25%-0.35% of C, 17%-19% of Cr, 17%-19% of Mn, 0.6%-1.2% of Si, 0.6%-1.0% of Ti, 1.2%-2.0% of W, 0-0.02% of P, 0-0.02% of S, 0.05%-0.25% of Y, 0.05%-0.25% of Ce, 0.025%-0.05% of Al and the balance Fe. A preparation method of the heat-resisting and wear-resisting alloy steel comprises the steps that scrap steel, low-carbon ferrochromium and electrolytic manganese are placed in a furnace to be molten; oxygen blowing is conducted when the temperature of molten steel is higher than 1580 DEG C; 70% of aluminum, 20% of silicon and 10% of calcium wires are inserted into per ton of molten steel, composite powder containing 1% of carbon, 50% of silicon and 49% of calcium is added onto the liquid surface, slagging is conducted, ferrotitanium and ferrotungsten are added, yttrium-cerium-based mixture rare earth is added to the bottom of a steel ladle, and the tapping temperature is 1620-1640 DEG C; a casting is cast at the temperature of 1530-1580 DEG C; and heat treatment is conducted at the temperature of 1050-1100 DEG C, the casting is placed in water after being discharged out of the furnace, and the water temperature is not higher than 38 DEG C. According to the heat-resisting and wear-resisting alloy steel and the preparation method thereof, through the optimal design of the elements, melt purification and optimization of the heat treatment technique, the steel which is high in heat strength, abrasion resistance and heat resistance is obtained.

The invention discloses a composite ceramic material and an inner container of an electric cooker prepared from the composite ceramic material. The composite ceramic material is prepared from the following components in parts by weight: 3-8 parts of barium carbonate, 20-35 parts of calcite, 5-10 parts of kaolin, 35-55 parts of silica powder, 3-8 parts of potassium nitrate, 10-15 parts of paraffin, 3-8 parts of sodium carbonate, 7-8 parts of boric acid, 11-15 parts of quartz, 50-75 parts of aluminum nitride powder, 2-3 parts of yttrium oxide and 3-5 parts of lanthanum oxide, wherein the aluminum nitride powder is generated by reacting aluminum oxide powder serving as an aluminum source and carbon black powder in the flowing nitrogen atmosphere at the temperature of 1500-1700 DEG C; calcium oxide is added as a catalyst in the reaction process, and decarbonization is carried out in dry air with the temperature of 700-800 DEG C after the reaction is finished; the mass content of cation impurities in the aluminum oxide powder is lower than or equal to 0.02%, and the mass contents of silicon and iron impurities are respectively lower than 0.001%; and the average particle size of the carbon black powder is 35-40nm, and the specific surface area is smaller than or equal to 90m<2> / g.

The invention relates to the technical field of water heater enamel inner containers, in particular to a healthy electric water heater. The healthy electric water heater aims to improve the anti-corrosion property and the strength of a water heater inner container. According to the healthy electric water heater, the enamel material for manufacturing the enamel inner container of the healthy electric water heater is composed of various components, performance testing experiments show that the enamel inner container of the healthy electric water heater has good acid resistance and oxidation resistance, mechanical energy shock resistance and temperature rapid change resistance are also excellent, when the material is used for manufacturing the enamel inner container of the water heater, the advantages of being good in safety performance, wide in applied range and long in service life are achieved, and the healthy electric water heater is applicable to the field of water heater inner container manufacture.

The invention belongs to the field of a ceramic material, and relates to a composite ceramic for the inner container of a rice cooker, and a ceramic inner container. The current rice cooker with the ceramic inner container has the problems of being slow to heat, uneven in heat transfer, frequently cannot boil rice and the like, and the ceramic inner container with better heat transfer property has bad anti-oxidization capability to seriously influence the service life and safety property of the ceramic inner container. In order to overcome the deficiencies of the prior art, the invention provides a ceramic material for manufacturing the inner container, and the ceramic container thereof. The heat diffusion property test and the anti-oxidization property test show that the ceramic material has the advantages of being fast in heat transfer efficiency and strong in anti-oxidization capability, as well as the advantages of being good in safety performance, low in energy consumption, and long in service life when being used for manufacturing the inner container of an electric rice cooker, thus being suitably applied in the field of manufacturing the inner container of the electric rice cooker.

The invention provides a titanium alloy laser surface silicide enhanced multielement high-temperature alloying layer. A titanium alloy Ti-6Al-4V serves as a base material, mixed powder composed of aluminite powder, niobium powder and silica powder serves as an alloying powder material to be arranged in the surface of the titanium alloy Ti-6Al-4V base material in advance, and a laser surface alloying technology is adopted for preparation, wherein the purity of the aluminite powder is higher than or equal to 99.0%, the grain diameter of the aluminite powder ranges from 50 microns to 100 microns, the purity of the niobium powder is higher than or equal to 99.5%, the grain diameter of the niobium powder ranges from 50 microns to 100 microns, the purity of the silica powder is higher than or equal to 99.5%, the grain diameter of the silica powder ranges from 50 microns to 100 microns; and the alloying powder material is prepared from, by weight, 100 parts of the aluminite powder, 10-20 parts of the niobium powder and 10-20 parts of the silica powder. The alloying layer is simple in composition proportion, the extremely-high hardness and the good high temperature frictional wear resistance are shown, and the excellent long-term high temperature oxidation resistance is achieved.

The present invention discloses a Pt Ni Al bonding layer doped with binary trace active elements and capable of being completely oxidation resisting at 1200 DEG C and a preparation method thereof and belongs to the field of novel thermal barrier coatings and the preparation technologies. According to the invention, firstly, a Pt layer with the thickness of 5-10 microns is prepared on a nickel base monocrystal high temperature alloy matrix through the plating or the electron beam physical vapor deposition method, and then a NiAlHfZr coating with the thickness of 20-60 microns is deposited on the Pt layer through the electron beam physical vapor deposition method. The Pt layer reduces the interfacial holes and effectively improves the adhesion of an oxidation film; binary doping of Hf, Zr enables the NiAl coating surface to be smoother and denser and enables the oxidation film generated during the oxidation process on the coating surface to be straighter, especially with little oxidation increase, and greatly improves the oxidation resistance of the coating. The Pt Ni Al bonding layer is completely oxidation resisting at 1200 DEG C. The service life of the coating is prolonged to certain degree through doping of binary elements namely Hf and Zr and Pt modification.

The invention belongs to the technical field of the preparation of high-temperature anti-oxidation coatings, in particular to an anti-oxidation coating used in a long-time heat treatment process of iron, and the like at high temperature. The coating comprises solid powder and liquid, and is characterized in that the solid powder comprises following components by weight part: 30 to 50 parts of glass powder, 10 to 50 parts of boron nitride, 2 to 5 parts of chromic oxide and 3 to 10 parts of metal aluminum powder; and the liquid comprises following components by weight part: 0.1 to 5 parts of modified magnesium aluminosilicate, 20 to 35 parts of organic silicone resin and 100 parts of xylene. Through the adoption of the coating, oxydic weight gain of carbon steel or alloy steel can be guaranteed to be reduced by more than 80 percent in the heat treatment process for a long time (larger than 30 hours) at temperature of 1200 DEG C and above.

The invention relates to a grid section used for sintering acid mine. The grid section comprises the following components in percentage by weight: 1.1-1.3% of C, 26.0-28.0% of Cr, 0.3-0.5% of Mo, 1.0-1.5% of Ni, 1.0-1.5% of Si, 0.5-1.0% of Mn, 0.10% of Ti, 0.05-0.15% of Re, 1.0-2.0% of Al and the balance of Fe. The grid section disclosed by the invention is totally suitable for acid mine sintering working conditions and satisfies use requirements, the service life of the grid section is prolonged to more than 12 months from less than 3 months, and therefore the use cost of the grid section is greatly lowered. Meanwhile, replacement frequency of the grid section can be reduced, the labor intensity of operators is lowered, downtime for replacing the grid section is shortened, and production efficiency is improved.