10results about How to "Improve thermal shock performance" patented technology

The invention discloses an aluminum oxide and aluminum nitride composite electrostatic chuck which comprises a metal base, an aluminum oxide ceramic structural part, an aluminum nitride ceramic dielectric layer, a heating layer and an adsorption electrode layer. The aluminum oxide ceramic structural member is coated outside the metal base, and the aluminum nitride ceramic dielectric layer comprises a first dielectric layer, a second dielectric layer and a third dielectric layer. The aluminum oxide ceramic structural member is coated outside the metal base, and the aluminum oxide ceramic structural member has the characteristics of high temperature resistance, corrosion resistance and wear resistance, so that the corrosion of plasmas to the metal base can be effectively shielded, and meanwhile, particulate pollutants are not generated to pollute a wafer; according to the composite electrostatic chuck, the aluminum nitride ceramic dielectric layer is arranged, and the aluminum nitride ceramic dielectric layer has excellent heat-conducting property and temperature uniformity, so that the composite electrostatic chuck can effectively control the temperature in the semiconductor processing process, the temperature uniformity of the surface of a wafer is ensured, the processing consistency is good, and the processing precision and the product quality are improved.

The invention relates to the technical field of filtration and purification of special ceramics and aluminum industrial melts, and discloses a corundum-mullite ceramic filter plate and a preparation method of the corundum-mullite ceramic filter plate. Comprising the following components in parts by weight: 30-50 parts of corundum, 3-7 parts of silica fume, 10-15 parts of kyanite, 10-15 parts of activated alumina powder, 3-5 parts of borax, 8-16 parts of silica sol, 0.5-1.5 parts of citric acid and 0.1-0.3 part of a sintering aid. In the formula system, mullite and aluminum borate which are synthesized under high-temperature sintering are used as binding agents of inert materials, and the binding agents are not subjected to erosion reaction with alloy elements in high-temperature molten aluminum and have good mechanical strength and thermal shock performance; the kyanite part generates volume micro-expansion after being subjected to mullitization, a special structure is formed in an internal pore channel structure of the ceramic filter plate, impurity components in high-temperature molten aluminum can be adsorbed, and the filter precision of the ceramic filter plate is improved.

The invention discloses a cement-free high-chromium castable and a preparation method thereof, chromium oxide frits or chromium-aluminum solid solution particles, chromium oxide fine powder and alumina micro powder are used as main raw materials, zirconium oxide micro powder, magnesium oxide fine powder, silicon oxide micro powder and the like are added, and the cement-free high-chromium castable is prepared through vibration molding. The process is simple, traditional aluminate cement is not used as a binding agent, the porosity of the prepared cement-free high-chromium castable is reduced, the volume density, the compression strength and the breaking strength are improved, and due to the fact that spinel is generated in the use process of the castable and the castable does not contain calcium oxide, the cement-free high-chromium castable has the advantages of being environmentally friendly and low in cost. The thermal shock resistance and the slag corrosion resistance of the high-chromium castable are obviously improved.

This invention discloses a preform for the hot top of a crystallizer specifically for semi-continuous casting of aluminum-lithium alloys and its manufacturing method. Addressing the problems of severe interfacial reactions between existing refractory materials and molten aluminum-lithium alloys, resulting in poor forming quality of semi-continuous casting ingots, this invention employs a gradient composite structure design: lithium aluminate is introduced into the working layer to thermodynamically suppress interfacial reactions by increasing the intrinsic lithium chemical sites; the insulation layer contains β-lithium nepheline and lithium aluminate to improve the insulation performance and thermal shock resistance of the hot top. Furthermore, by using a gradient distribution of lithium compound concentrations and types, combined with a multi-stage sintering process, the interlayer bonding strength is improved. Results show that this invention not only significantly reduces the interfacial reaction between the molten aluminum-lithium alloy and the hot top during semi-continuous casting, improving the forming quality of aluminum-lithium alloy ingots, but also extends the service life of the preform.

The invention discloses a low-creep high-alumina brick based on electric melting a-beta corundum brick waste and a preparation method thereof, and belongs to the technical field of high-alumina bricks. The low-creep high-alumina brick comprises the following raw material components in percentage by mass: 20-30% of electric melting a-beta corundum brick waste with the particle size of 0-3.5 mm; 20 to 30 percent of 85 bauxite particles; 10-20% of fine andalusite powder; 10%-20% of sillimanite fine powder; 0-15% of fused corundum fine powder; 0-15% of Guangxi white mud powder; and 2-5% of an additive which is externally doped. The obtained low-creep high-alumina brick is good in microstructure, stable in product quality, high in compression strength, good in thermal shock performance and low in creep rate and is far superior to similar high-alumina bricks, the performance of the low-creep high-alumina brick is greatly improved, and the low-creep high-alumina brick has important application prospects.

The invention discloses a magnesium aluminate spinel brick produced from alumina-chromium slag and a preparation method thereof, the preparation method comprises the steps of material preparation, material mixing, molding and drying, and the magnesium aluminate spinel brick comprises the following raw materials by mass: 48-72% of aggregate, 8-12% of calcined alpha-Al2O3 micro powder CL370, 8-12% of fused spinel powder AMS-78, 8-12% of tabular corundum powder, 2-4% of fused magnesium powder, 0.5-1% of silica powder, 3-5% of a binder and 2-2.2% of water. The magnesium aluminate spinel brick disclosed by the invention has relatively high volume density and relatively low porosity, the slag corrosion resistance and thermal shock resistance of a product are improved by replacing tabular corundum with the original alumina-chrome slag, and the cost is greatly reduced by taking the recycled chrome corundum as a main raw material; and the device is high in cost performance, energy-saving and environment-friendly, can be used for pressing working lining bricks of molten pool parts of various specifications and models, and is wide in application range.

The invention discloses a ceramic material with high thermal shock resistance and a preparation method thereof, the ceramic material comprises the following raw materials by weight: 100 parts of alumina powder, 3-18 parts of pretreated mullite fiber, 2-8 parts of a binder, 2-5 parts of a dispersant and 2-8 parts of a mineralizer, and the mineralizer comprises 1-4 parts of aluminum fluoride and 1-4 parts of magnesium fluoride. By pretreating mullite fibers, a low-expansion composite fiber component is formed at a high temperature, a mineralizer is introduced to stabilize the strength and structure of the fibers at the high temperature, aluminum oxide composite granulation powder is prepared through a spray granulation process, the mullite fibers form a net-shaped structure in the ceramic material, the thermal expansion coefficient is smaller, thermal stress is effectively absorbed, and the thermal conductivity of the ceramic material is improved. The ceramic material is not cracked after being heated and water-cooled to room temperature, and can bear higher temperature change, so that the thermal shock property of the ceramic material is effectively improved; meanwhile, the alumina powder serves as a main component, high hardness and high strength are guaranteed, and the toughness and impact resistance of the material are improved by adding the mullite fibers.

A refractory material and its preparation method and application, belonging to the technical field of refractory materials, the refractory material uses plate-shaped corundum modified coarse aggregate, plate-shaped corundum fine aggregate, modified artificial graphite, antioxidant, anti-corrosion agent and adhesive as raw materials. Among them, the plate-shaped corundum coarse aggregate is modified by combining coal gangue purification powder and nano-grade carbon black, which has a smaller porosity, increased volume density and strength. The delayed petroleum coke powder is modified by using plate-shaped corundum powder and phenolic resin powder, and the modified artificial graphite is sintered to prepare the modified artificial graphite, which has a certain improvement in compressive strength, thermal shock resistance, creep rate, etc., and the graphite component is not exposed on the surface of the slide. The modified plate-shaped corundum coarse aggregate and the modified artificial graphite are used in combination, which can greatly improve the strength, good thermal shock stability, and low creep rate; each time the hole is expanded, the diameter is small, the erosion resistance and erosion resistance are good, the carbon content entering the molten steel is very low, and it will not greatly affect the carbon content of low-carbon molten steel, and can be used for the pouring of low-carbon molten steel.

The invention relates to an MgO-based slag stopper castable for converter steelmaking and tapping, which comprises a castable aggregate and a binding agent, and the castable aggregate comprises the following components in parts by weight: 50-60 parts of dead burnt magnesia; 15 to 25 parts of goose warming stone; 8-15 parts of slag powder; 5-10 parts of coke powder; 5 to 10 parts of bentonite; the binding agent comprises the following components in parts by weight: 35-45 parts of phenolic resin; 15 to 25 parts of epoxy resin; 10 to 20 parts of polyurethane resin; 5 to 10 parts of polystyrene; 0-5 parts of organic silicon powder; 0-5 parts of diphenyl ether; 3-5 parts of sodium alginate; 2 to 5 parts of cyclohexanone peroxide; 1-5 parts of cobalt naphthenate; the weight percentage ratio of the castable aggregate to the binding agent is 100: (1.5-2.5). The novel castable has the beneficial effects that the novel castable which takes dead burnt magnesia as a main material and is added with a certain amount of goose warming stone as a weight increasing aggregate has the advantages of high low-temperature strength and high-temperature strength, good thermal shock resistance, short manufacturing period and the like, and the dead burnt magnesia, the goose warming stone material, the slag powder and other raw materials are easy to obtain and low in price; and therefore, the manufacturing cost of the slag stopping plug castable is greatly reduced.

The invention discloses a high-strength and high-toughness filtering material and a production method thereof. The high-strength and high-toughness filtering material comprises a dry main material and a binding agent, the dry main material is prepared from the following components in parts by weight: 10 to 18 parts of quartz powder, 1 to 5 parts of silica fume powder, 12 to 20 parts of wollastonite, 1 to 4 parts of andalusite, 0.3 to 1 part of explosion-proof fiber, 1 to 5 parts of calcined aluminum oxide, 0.5 to 2 parts of magnesium fluoride and 10 to 15 parts of calcium aluminate cement; the binding agent comprises silica sol, xanthan gum, purified water and calcium aluminate cement, the silica sol accounts for 18-55% of the total weight of the dry main material, the xanthan gum accounts for 1.8-8.75% of the total weight of the dry main material, the purified water accounts for 5.45-11.25% of the total weight of the dry main material, and the calcium aluminate cement accounts for 18.2-22% of the total weight of the dry main material. The production method comprises the following steps: dry mixing, wet mixing, forming, curing, firing and detecting. The filtering material prepared by the invention has relatively high toughness and strength, excellent thermal insulation performance, good aluminum non-sticking performance, good thermal vibration performance and low heat conductivity coefficient; and the service life of the material is long, the manufacturing cost is reduced, and the material has good market effect and application prospect.