30results about How to "Low expansion properties" patented technology

The invention is a palmityl trimethyl ammonium bromide expansive soil modifier, characterized in comprising the preparing steps of: (1) at room temperature, preparing saturated lime water solution; (2) weighing the needed palmityl trimethyl ammonium bromide in the mass ratio of palmityl trimethyl ammonium bromide to dry soil = 0.5 : 99.5; (3) dissolving the palmityl trimethyl ammonium bromide in the saturated lime water solution, where it needs to notice that the dosage of the saturated lime water solution is able to completely dissolve the palmityl trimethyl ammonium bromide. And the advantages: making the soil property still able to reach the specified standard under the water influence; improving engineering property of expansive soil; unable to cause environmental pollution. And its construction method uses osmotic modification principle and fully uses multi-crack property of expansive soil and is simple and convenient.

The invention relates to a heat-conducting polymer-base composite material and a preparation method thereof. The invention aims to solve the problems of high cost of the existing preparation method and poor heat conductivity of the obtained polymer-base composite material. The product is composed of a through-hole-bearing composite material plate, a filling material filled in the through hole of the through-hole-bearing composite material plate, film material layers positioned on the upper and lower surfaces of the through-hole-bearing composite material plate, and adhesive layers for bonding the film materials and the through-hole-bearing composite material plate. The method comprises the following steps: 1. preparing the through-hole-bearing composite material plate; 2. preparing a precuring plate; 3. preparing the composite plate; 4.preparing the cleaned composite plate; and 5. preparing the heat-conducting polymer-base composite material. The heat conductivity coefficient of the heat-conducting polymer-base composite material can reach 200-250 W/(m.K).

The invention relates to wear-resistant antibacterial ceramic and a processing method thereof. The processing method includes the steps that a body material is fired for the first time to form a plainbody, then glaze is applied to the two faces of the plain body to form glaze layers, and firing is conducted for the second time, and then the wear-resistant antibacterial ceramic is obtained, wherein the body material is made of raw materials such as sodium bentonite, coke gemstone, pyrophyllite, dolomite, and the like, the glaze is prepared from silicon dioxide, potassium fluoroaluminate, boronoxide, barium oxide, yttrium oxide, titanium-silicon co-doped graphene, large ball mud and other raw materials. Wherein the second firing comprises three-stage heating and heat preservation and three-stage cooling, each heating and heat preservation is sequentially carried out in an air atmosphere, a nitrogen atmosphere and a hydrogen atmosphere, and the three-stage cooling is natural cooling, rapid cooling and natural cooling. The obtained ceramic product has excellent antibacterial performance and wear resistance, and meets the high-quality requirements of ceramics.

The invention discloses a composite ceramic material for an LED energy-saving lamp base. The composite ceramic material is calcined from such components as 12-15 parts of nano-zinc oxide, 5-10 parts of silicon dioxide, 6-8 parts of magnesium carbonate, 80-100 parts of active kaolin, 15-18 parts of magnesium oxide, 10-12 parts of titanium dioxide, 100-120 parts of silicon nitride, 50-60 parts of silicon carbide and 3-5 parts of magnesium nitride. The composite ceramic material for the LED energy-saving lamp base has the characteristics of high thermal conductivity and low expansion; the formed composite ceramic material is improved in thermal conductivity, reduced in thermal expansion and enhanced in heat dissipation capability to the environment; as a result, the working temperature of an LED semiconductor chip can be reduced, the luminous efficiency of the same can be improved; the structural stress of the LED semiconductor chip and the base is reduced and the working service life of the LED energy-saving lamp is prolonged.

The invention relates to the technical field of electronic components and discloses a sapphire insulator metal shell. The sapphire insulator metal shell comprises a frame body and a cover plate; a bottom plate is fixedly installed at the bottom of the frame body; a carrier located in the frame body is fixedly installed at the top of the bottom plate; an annular frame is fixedly installed at the top of the frame body; a connecting ring is fixedly installed on the right side of the frame body; and a lead is fixedly installed in the connecting ring. According to the sapphire insulator metal shelland the production process thereof disclosed in the invention, through the material, the structure, the connection process and the like of a semiconductor integrated circuit packaging shell in the prior art, the purpose of improving the using performance of the semiconductor integrated circuit packaging shell is achieved, and the problems that when an existing semiconductor integrated circuit packaging shell is used, the connecting performance between packaging shell structures is common, the sealing welding process is not perfect, a selected insulating medium cannot bear ultrahigh withstoodvoltage, and the using performance is reduced are solved.

The present invention relates to a conveyer (10) which is applied to conveying equipment (F) in tobacco processing industry and used for conveying tobacco materials. The conveyer (10) is characterized in that: the conveyer (10) is designed into a fabric strip (10) having warps (102) and wefts (104), wherein the fabric strip (10) has an inner side operating surface (12) and an outer side bearing surface (11) used for receiving the tobacco materials to be conveyed, wherein the inner side operating surface (12) is provided with a projection (14) which is engaged with a projection containing part (22) of a conveying wheel (20). In addition, the present invention also relates to a transmission gear of the conveyer (10) used for conveying the tobacco materials, the conveying equipment used for conveying the tobacco materials in the tobacco processing industry, and a method used for manufacturing the conveyer (10) which is applied to the conveying equipment in the tobacco processing industry and used for conveying the tobacco materials.

The invention provides a preparation method of a copper-based composite. The preparation method comprises the steps as follows: copper powder, zirconium tungstate powder and barium strontium titanatepowder are provided and mixed, and first mixed powder is obtained; the first mixed powder is subjected to ball milling with a dry ball milling method, and second mixed powder is obtained; the second mixed powder is subjected to first reduction heat treatment, and third mixed powder is obtained; the third mixed powder is subjected to cold isostatic pressing, and a first block is obtained; the firstblock is subjected to hot press sintering, and a second block is obtained; the second block is rolled. The dry powder mixing process is used, so that the powder mixing efficiency and powder mixing effect are improved. The reduction process is designed specially, so that powder oxidized in the powder mixing process can be accurately reduced to the original state while oxide powder cannot be reduced and the oxygen content in oxide cannot deviate from the ideal value. The common hot press sintering method is used, the technology is simple and mature, and the cost is low.

The invention discloses a thermosetting epoxy resin composition, which contains modified silicon dioxide and therefore can be used in the preparation of epoxy resin laminated boards with a low expansion coefficient property and excellent drilling processability. The modified silicon dioxide does not contain crystal water, has a low expansion coefficient property and comprises 40 to 80 weight percent of silicon dioxide and 60 to 20 percent of inorganic additive. And the modified silicon dioxide is prepared by sintering and melting at a high temperature above 1,000 DEG C and crushing.

The invention discloses a method for preparing a cathode material of tin-carbon lithium ion cathode material. The method comprises the following steps: (1) performing doping modification on tin dioxide, namely weighing certain amounts of nano tin dioxide and red copper oxide in a ratio of 100:(10-50), performing dry-method ball milling for 1 hour; and performing carbon heat reduction in an atmosphere furnace; (2) performing composite pelletizing on a tin dioxide modification product with graphite; (3) performing secondary wrapping modification. According to the method, as the tin dioxide is subjected to doping modification with the red copper oxide, the expansion property of a tin-carbon compound can be degraded, and the circulation property can be improved; due to two times of pelletization with processes of molding, roasting and dispersion formation, the method is short in time, simple in process and easy in industrial large-scale production; meanwhile, advantages of pelletization oftin dioxide and graphite and graphite and graphite can be achieved, and a function of surface modification upon the graphite with the tin dioxide can be also achieved; due to two times of coating, surface defects caused in the two times of pelletization process can be remarkably alleviated, and the first efficiency and the circulation property of a product can be improved.

The invention discloses a method for preparing a copper-antimony-doped tin-carbon-lithium ion cathode material. The method comprises the following steps: (1) carrying out doping modification on tin dioxide, namely weighing certain amounts of tin dioxide, copper and antimony, and carrying out dry-method ball-milling mixing for 0.5-1.5 hours in a ratio of 100:(5-20):(5-20); (2) carrying out composite pelletizing on a tin dioxide modified product and graphite; (3) carrying out secondary coating modification. By adopting the method, copper and antimony are adopted to carry out doping modificationon the tin dioxide, so that the expansion properties of a tin-carbon compound can be degraded, and circulation properties can be improved; secondary pelletizing is carried out through isostatic compaction, roasting and dispersion shaping processes, and the method is short in time, simple in process and easy in industrial large-scale production; meanwhile, the advantage of pelletizing of tin dioxide and graphite and graphite and graphite can be taken into play, and a function that surface modification of the graphite with the tin dioxide can be also achieved; due to two times of coating, surface defects caused in a secondary pelletizing process can be remarkably alleviated, and the first-time frequency and the circulation properties of a product can be improved.

The invention discloses a composite heat dispersing material for LEDs. The composite heat dispersing material comprises, by mass, 63-65 parts of aluminum, 15-18 parts of iron, 5-8 parts of vanadium boride, 1-2 parts of zirconium boride, 4-5 parts of ferrochrome slag, 8-10 parts of gold tailings, 1-3 parts of glycerol, 1-2 parts of triethanolamine, 0.5-0.8 part of boric acid, 12-14 parts of organic chelated titanium, 15-18 parts of aluminum nitride, 1-2 parts of barium carbonate, 6-8 parts of calcite, 10-12 parts of talcum, 3-5 parts of medical stone, 1-2 parts of manganese sulfide, 1-3 parts of zinc gluconate, 1-3 parts of antioxidant and 4-5 parts of auxiliaries. The composite heat dispersing material for LEDs can improve the heat dispersion performance of materials and obtain good service properties.