34results about How to "Adjustable expansion coefficient" patented technology

A composite silicon aluminocarbide material or its member is prepared through preparing the aluminum phosphate solution from phosphoric acid and aluminum hydroxide, mixing it with polyethanediol, distilled water, dextrin and glutinous rice flour to obtain binder, mixing it with silicon carbide microparticles, die pressing to obtain prefabricated raw material, heat treating in inertial gas or air, pressure casting or vacuum impregnating to osmosize the molten aluminum alloy into it, and machining by needed sizes. Its advantages are low density, adjustable expansibility, high thermal conductivity, elastic modulus and air tightness.

The invention relates to a steel blank grinding abrasion wheel adopting microcrystal ceramic bonding agents, which is in a structure made of polycrystalline solid materials with the coexistence of glass and crystals and adopts the bonding agents of clay, feldspar, boron-containing microcrystal glass, pyrophyllite and soapstone to be made into high-intensity and low-shrinkage engineering ceramic bonding agents, good performance of the glass and the ceramics such as high mechnical intensity, wear resistance, corrosion resistance and the like are integrated, then, the glass and the ceramics are combined with mixed grinding materials, a molding pressing method is adopted for the high-pressure double-side pressing process forming, the low-temperature firing is adopted, the positive pressure reducing atmosphere heat simulation crystallization is adopted at the 800 DEG C heat insulation section, and the mixed grinding material and micro porous glass phase high-intensity microcrystal engineering ceramic composite structure is formed, so the intensity and the bonding degree of the steel blank grinding abrasion wheel are greatly improved, the use linear speed of the abrasion wheel is accelerated, and the safety factor is high. The steel blank grinding abrasion wheel belongs to the novel efficient special steel blank grinding abrasion wheel with the characteristics that the intensity andthe hardness are high, the tissue density is uniform, the grinding ratio is great under the condition of high-speed grinding, workpieces can not be damaged through firing, and the automation of iron and steel industries is easy to realize.

The present invention discloses a bismuthate low-melting point and lead-free sealing grass and a preparation method thereof. The bismuthate low-melting point and lead-free sealing grass powder comprises, by mass, 75-90% of base glass and 10-25% of a filler, wherein the filler is a zirconium phosphate salt with an expansion coefficient of -5*10<-6>k<-1>-5*10<-6>k<-1>. The bismuthate low-melting point and lead-free sealing grass of the present invention has characteristics of lead-free property and green environmental protection, can replace the lead-containing glass so as to eliminate the pollution due to the lead, and has excellent chemical stability. The production process is simple and the cost is low. Compared to other filler-doped sealing glass powders, the sealing temperature of the present invention is low, the glass transition temperature of the present invention is 330-370 DEG C, the softening temperature of the present invention is 370-410 DEG C, the sealing temperature of the present invention is less than 450 DEG C. With adjusting the proportion of the filler, the adjustable expansion coefficient can be realized at the low sealing temperature, wherein the adjustment range is (70-90)*10<-7>/DEG C, such that different requirements of the sealing device to the expansion coefficient of the sealing material can be met, and the sealing for VFD, PDP, CRT and other glass products can be directly performed.

The invention belongs to the technical field of inorganic composite materials, and particularly relates to a novel controllable thermal expansion composite conductive ceramic material alpha-Cu2V2O7-Al and a preparing method thereof. The material is prepared through solid-phase sintering of alpha-Cu2V2O7 and Al powder, wherein the mass percent of the Al powder ranges from 5% to 80%. The preparing method comprises the steps such as material mixing, preforming blank forming and sintering. The provided controllable thermal expansion composite conductive ceramic material alpha-Cu2V2O7-Al is simple in preparing technology, low in cost, environment-friendly, free of pollution and suitable for industrial production. Meanwhile, the material has the beneficial effects that the expansion coefficient can be adjusted, and the high-temperature conductive performance is good; and the controllable thermal expansion composite conductive ceramic material alpha-Cu2V2O7-Al has wide application prospects in integrated circuits, photoelectron instruments and meters and other technical fields with the high requirements for base material heat matching and high-temperature electric conduction and related products of the technical fields.

The invention discloses concrete mortar and belongs to the field of mortar. The concrete mortar takes lignite as a raw material; the lignite can be pyrolyzed under a high-temperature condition to generate tar and a coke component; the tar has the effect of sticking each component; the coke component can react with hydroxyl silicate in stone material liquid in a system under the catalysis effect ofnano iron powder to generate a silicon carbide framework, so that a reinforcing effect is realized and the toughness of the system is improved; asphalt fibers are oxidized through potassium permanganate so that the adsorption force of the asphalt fibers on nano magnesium oxide is enhanced, and the adsorption performance of the asphalt fibers on silicon dioxide generated by hydrolyzing tetraethylorthosilicate can also be effectively improved; the early age strength of a cement-based grouting material is improved, and the expansion coefficient of the cement-based grouting material can be adjusted through magnesium oxide, so that the cement-based grouting material is not easy to crack after being cured. By adopting the concrete mortar provided by the invention, the problems that common mortar at present is easy to hollow and rack, and the toughness and mechanical property are poor are solved.

The invention discloses Ce-containing low-temperature sealing glass as well as preparation and application method of the Ce-containing low-temperature sealing glass. The Ce-containing low-temperature sealing glass consists of the following raw materials: B2O3, Bi2O3, ZnO and Ce(NO3)3 in a molar ratio of (10-50):(20-40):(5-30):(0-30). Through the coordination between high-concentration Bi2O3 and B2O3, the softening temperature of glass is lowered, so that low-temperature sealing is realized; Ce<3+> in a glass network prepared by melting quenching is transformed into Ce<4+>, the transformation of Bi<3+> in glass into Bi<5+> is prevented, and the refractive index of glass is stabilized; and Ce not only can further lower the softening temperature of the sealing glass, but also can adjust the expansion factor of the glass so as to remarkably improve the sealing property of the sealing glass. Moreover, Ce remarkably reduces the surface tension of the glass, improves the interface bonding property between the sealing glass and an alloy connector and is applicable to the field of photoelectric materials and other low-temperature precise sealing. According to the invention, the preparation raw materials are simple and easily available, the cost is low, the technology is simple and feasible, and the prepared low-temperature sealing glass has good performance and stable refractive index and meets the conditions of practical utilization and industrialization.

The invention discloses a cement-based grouting material, and belongs to the technical field of building materials. The cement-based grouting material is prepared according to the following steps: melting asphalt powder, performing high-voltage electrostatic spinningto obtain asphalt raw threads, soaking the asphalt raw threads in a potassium permanganate solution, performing oxidation to obtain oxidized asphalt fibers, mixing nano magnesium oxide, a silane coupling agent and an ethanol solution, performing ultrasonic dispersion, adding the oxidized asphalt fibers, performing mixing under stirring, adding tetraethoxysilane dropwise, performing mixing under stirring, performing filtering, performing washing, performing drying, and performing carbonizing to obtain modified asphalt fibers; mixing aluminum powder and glycerol under stirring, adding wheat gluten powder, performing mixing under stirring, adding water, performing swelling, allowing the obtained material to stand, and performing ultrasonic dispersion to obtain a modified aluminum powder dispersion liquid; and mixing cement, quartz sand, water, a water reducing agent, fly ash, mineral powder, slag, a defoaming agent, a water retaining agent, the modified asphalt fibers and the modified aluminum powder under stirring to obtain the cement-based grouting material. The cement-based grouting material obtained by the technical scheme has the advantages of good fluidity, early-stage strength and expansion performance.

The invention discloses an LED packaged with an AlSiC composite substrate. The LED comprises the AlSiC composite cooling substrate, an LED light source module, gold threads and an alumina ceramic frame, wherein the surface of the AlSiC composite cooling substrate is plated with a copper film and a silver film sequentially; the LED light source module is packaged on the AlSiC composite cooling substrate; the alumina ceramic frame is arranged on the outer side of the LED light source module and adheres to the LED light source module; two copper-film electrodes are plated on the alumina ceramic frame and connected with a positive pole and a negative pole of the LED light source module through the gold threads respectively. According to the LED, thermal expansion coefficients of the AlSiC composite substrate and an LED chip material are matched, so that an LED chip which is packaged on the substrate is not prone to falling, and the service life of the LED is prolonged.

The invention discloses a laser welding layer prefabricated part and preparation methods for the laser welding layer prefabricated part and an aluminum silicon carbide box body. The preparation methodfor the aluminum silicon carbide box body comprises the steps that 1, the laser welding layer prefabricated part is prepared; 2, the laser welding layer prefabricated part and a silicon carbide prefabricated part are laminated and matched; 3, an aluminum silicon carbide green body with the laser welding layer is prepared through vacuum air pressure infiltration; and 4, machining is carried out. The laser welding layer prefabricated part is formed by pressing particle-reinforced aluminum alloy powder, specifically, aluminum alloy powder is placed in a graphite mold, the graphite mold comprisesa female mold and a male mold, the aluminum alloy powder is laid at the bottom of the female mold, a hydraulic machine applies pressure of 0.5-2 MPa to the aluminum alloy powder in the female mold through the male mold and maintains the pressure to form the laser welding layer prefabricated part, wherein the particle size of the particle-reinforced aluminum alloy powder is 10-200 microns. A laserwelding layer is designed at the upper end of the aluminum silicon carbide box body, so that the laser welding problem between the aluminum silicon carbide box body and a cover plate is effectively solved, and the air tightness of the box body after sealing welding is ensured.

The invention discloses Sn-containing low-temperature seal glass and preparing and using methods thereof. The Sn-containing low-temperature seal glass is composed of B2O3, Bi2O3, ZnO and SnO2 according to a molar ratio of 10-50:20-40:5-30:0-30. Softening temperature of the glass is lowered through synergism of high-concentration Bi2O3 and B2O3 to realize low-temperature seal; Sn2+ in a glass network prepared through melting-quenching is converted into Sn4+ in the process of heating, conversion from Bi3+ in the glass to Bi5+ is stopped, and refractivity of the glass is stabilized; Sn can further lower the softening temperature of the seal glass and can adjust expansion coefficient of the glass, so that seal performance of the seal glass is improved remarkably; the glass is suitable for photoelectric materials and other low-temperature precise seal fields. The raw materials for preparation are simple and easy to obtain, the preparation method is stable, low in cost and simple and easy to implement, and practical and industrial conditions are met.

The invention belongs to the technical field of high-temperature-resistant coatings, and particularly relates to a high-temperature-resistant coating for automotive upholstery and a preparation methodthereof. The high-temperature-resistant coating is prepared from, by weight, 30-60 parts of organic silicon resin, 4-7 parts of epoxy resin, 3-5 parts of amino resin, 6-10 parts of nano zirconium oxide dispersion liquid, 1-3 parts of aluminum tripolyphosphate, 13-15 parts of low-melting-glass powder, 3-8 parts of talcum powder, and 2-5 parts of mica powder. The heat resistance of the prepared high-temperature-resistant coating is obviously improved, the high-temperature-resistant coating can resist the high temperature of 500 DEG C, the coating has high strength and good high-temperature resistance and wear resistance by adding the nano zirconium oxide dispersion liquid component, and the coating has excellent weather resistance and corrosion resistance by adding the aluminum tripolyphosphate and the low-melting-point glass powder component; and by adding the barium sulfate and the nano zirconium diboride, the wear resistance, the high temperature resistance and the corrosion resistance of the coating are further improved, and the comprehensive performance is excellent.

The invention discloses Mn-containing low-temperature seal glass as well as a preparation method and use method thereof. The seal glass comprises the following raw materials: B2O3, Bi2O3, ZnO and MnO2. By virtue of the coordination of high-concentration Bi2O3 and B2O3, the softening temperature of the glass is decreased, and low-temperature sealing is realized; by adding MnO2, the refractive index of the glass can be stabilized, furthermore, the softening temperature of the seal glass is further decreased, the swelling coefficient of the glass can be further regulated, and the sealing performance of the seal glass can be remarkably improved. The preparation method has the beneficial effects that the raw materials are simple and easily available, the process is simple and stable, the cost is saved, and the practical utilization and industrialization conditions are achieved. The seal glass is applicable to the fields of photoelectric materials, low-temperature precise packaging and the like.

The invention relates to the technical field of composite materials, and in particular relates to a preparation method of a two-phase composite material, and the two-phase composite material prepared by the preparation method. According to the method provided by the invention, firstly a silicon carbide ceramic biscuit M5 is prepared by using powder formed by silicon carbide powder with different particle sizes and wax slurry, the silicon carbide ceramic biscuit M5 is used as a part of a mold, a silicon ceramic biscuit M6 is prepared by means of hot press casting, the two biscuits are combined in the form of wax diffusion, demolding is performed, sintering is performed to obtain a ceramic substrate M7, and finally an aluminum alloy melt is infiltrated into the ceramic substrate M7 to form the two-phase composite material; and the two-phase composite material combines the advantages of aluminum silicon carbide and aluminum silicon in one, and has high thermal conductivity, an adjustable expansion coefficient, a low density, good strength and good weldability, the airtightness of the product after welding is less than 10<-10>Pa*m<3>/s, and the composite material is the best choice of a high-power package type tube shell.

The invention discloses glass powder with strong impact resistance and adjustable expansion coefficient and a preparation method thereof. The glass powder is prepared from the following raw materialsin parts by weight: 20-50 parts of SiO2, 20-40 parts of Bi2O3, 0-6 parts of Al2O3, 2-10 parts of ZnO, 5-20 parts of B2O3, 0-4 parts of SnO2, 0-2 parts of BaO, 1-8 parts of TiO2, 1-5 parts of Na2O and2-8 parts of Li2O. The preparation method of the glass powder comprises the following steps of mixing the raw materials, melting at high temperature, water quenching and cooling, performing ball milling, drying and sieving. Before the prepared glass powder is used, the glass powder with different expansion coefficients can be obtained through different heat treatment processes. The glass powder with different expansion coefficients can be obtained through a subsequent heat treatment process, can be matched with different glass, ceramic, metal and other base materials, and has a wide application range; and silicon oxide and bismuth oxide in the glass powder raw material can form bismuth silicate crystals at a certain temperature, so that the impact resistance and the acid resistance are enhanced.

The invention belongs to the technical field of graphene preparation, and particularly relates to a composite material for thermal management and a preparation method of the composite material. The composite material comprises two metal layers which are arranged at an interval, and a first heat transfer layer and a second heat transfer layer which are arranged between the two metal layers, and heat transfer interfaces of the first heat transfer layer and the second heat transfer layer are perpendicular to each other. The composite material is a thermal management material integrating the horizontal direction and the vertical direction, is an efficient thermal management structure vertically located between a heat source and a heat sink, and has better thermal conductivity and thermal expansion coefficient matching performance with an integrated circuit chip.