83 results about "Silicon boride" patented technology

Embodiments of the invention relate generally to systems used to measure mercury in gaseous emissions. In one aspect, the invention is directed to the use of silicon carbide as material for a thermal pyrolysis unit. In another aspect, at least one of silicon nitride, silicon boride, and/or boron nitride is used as material for a thermal pyrolysis unit. In another aspect, the invention is directed to an improved pyrolyzer design, in which a thermal pyrolysis unit comprises a tailpiece that allows water to be injected at the heated exit of the thermal pyrolysis unit. In another aspect, the invention is directed to the use of a coalescing filter in a scrubbing unit. In another aspect, the invention is directed to the use of a hydrophobic filter element in a scrubbing unit. One or more of these elements may be used in a conditioning module of a continuous emissions monitoring system, for example.

In a method of making a molybdenum, molybdenum silicide and molybdenum silicon boride composite material, a boron nitride powder, a silicon nitride powder and a molybdenum powder are mixed to form a composite precursor. The composite precursor is sintered in an atmosphere consisting essentially of hydrogen and argon to form a sintered material. The sintered material is hot isostatic pressed to form the composite material into a final shape.

The invention discloses a special-purpose casting material of a coal-injection duct. The special-purpose casting material comprises the following components in percentage by weight: 5%-15% of silicon carbide, 15%-30% of andalusite, 10%-25% of corundum, 5%-15% of spinel powder, 15%-20% of silicon boride powder, 5%-10% of zirconite powder, 5%-10% of mullite powder, 5%-15% of aluminum oxide micro powder, 3%-8% of silicon micro powder, 2%-5% of pure calcium aluminate cement, as well as anti-explosion fiber and sodium hexametaphosphate which respectively account for 0.3% of the total weight of the components. The special casting material of the coal-injection duct disclosed by the invention has seismic stability, high temperature resistance, volume stability and abrasive resistance, has high strength, and can be used for improving the defects that the coal-injection duct is not wear-resisting and not thermal-spalling-resistant, so that the service life of a cement kiln coal-injection duct is prolonged to about 12-15 months from about 6-8 months at present.

The invention relates to a ceramic membrane coating for an interior decorative plate of an urban rail transit vehicle. The ceramic membrane coating is characterized by comprising the following three raw material components in percentage by mass: 60-65 parts of a first component, 28-34% of a second component and the balance being a third component, wherein the first component is color paste, the second component comprises siloxane, and the third component is acid. The conventional ceramic membrane coating is of a double-coating structure comprising a base coating and a surface coating; generally speaking, the base coating has a color, mechanical performances and the like, and the surface coating has a using function, luster and the like. The coating disclosed by the invention is of a single-coating structure and not only has the functionality, but also has the luster and color; nanometer silicon boride has the characteristics of oxidation resistance, heat shock resistance, chemical erosion resistance and the like and particularly has the very high strength and stability under shock; and by using the ceramic membrane coating, the carriage matrix of a locomotive can be protected, the service cycle of the ceramic membrane coating can be prolonged, and the service life of the ceramic membrane coating can be prolonged.

Embodiments of the invention relate generally to systems used to measure mercury in gaseous emissions. In one aspect, the invention is directed to the use of an inert covalently bonded material selected from silicon carbide (SiC), silicon oxides (SiO_n, n=1-2), silicon nitride (e.g. Si₃N₄), silicon boride (e.g. SiB₆), boron nitride (e.g. BN) and mixtures thereof as material for a thermal pyrolysis unit. In another aspect, the invention is directed to an improved pyrolyzer design, in which a thermal pyrolysis unit comprises a tailpiece that allows water to be injected at the heated exit of the thermal pyrolysis unit. In another aspect, the invention is directed to the use of a coalescing filter in a scrubbing unit. In another aspect, the invention is directed to the use of a hydrophobic filter element in a scrubbing unit. One or more of these elements may be used in a conditioning module of a continuous emissions monitoring system, for example.

The invention belongs to the technical field of refractory materials, and provides a silicon carbide refractory material and a preparation method thereof. The silicon carbide refractory material comprises, by weight, 25-40 parts of silicon carbide powder, 4-8 parts of silica fume , 1-5 parts of aluminum powder, 5-13 parts of titanium dioxide, 5-10 parts of zirconium oxide, 0.5-3 parts of polyhedral oligomeric silsesquioxane, 0.5-2 parts of molybdenum carbide, 0.5-2 parts of silicon boride, 0.5-1.5 parts of erbium acetate, 0.5-1.5 parts of ytterbium oxide, 1-3 parts of diamond and 3-5 parts ofbinding agent. The preparation method comprises the following steps: mixing the silicon carbide powder, the silica fume, the aluminum powder, the titanium dioxide and the zirconium oxide, grinding themixture to obtain first mixed powder, reacting the erbium acetate, the ytterbium oxide and the diamond to obtain second mixed powder, mixing the first mixed powder with the second mixed powder, mixing the obtained mixture with other components in the formula, and firing the obtained mixture to obtain the silicon carbide refractory material. By means of the technical scheme, the problems that in the prior art, a refractory material is poor in oxidation resistance and not high in strength are solved.

Disclosed herein is a method for making a combinatorial library comprising disposing on a substrate comprising silicon, silicon nitride, silicon carbide or silicon boride at least one reactant, wherein the reactants are lithium, magnesium, sodium, potassium, calcium, aluminum or a combination comprising at least one of the foregoing reactants; heat treating the substrate to create a diffusion multiple having at least two phases; contacting the diffusion multiple with hydrogen; detecting any absorption of hydrogen; and/or detecting any desorption of hydrogen.

The invention discloses wear-resistant ecological environment-friendly lubricating oil. The wear-resistant ecological environment-friendly lubricating oil is characterized by comprising the followingcomponents in parts by weight: 50 to 60 parts of base oil, 10 to 20 parts of single-ended epoxy polyether modified amine-terminated hyperbranched polyester, 3 to 7 parts of single-ended hydroxypropylsilicone oil modified black phosphorus, 0.5 to 1.5 parts of silicon boride, 0.2 to 0.5 part of a coupling agent, 0.5 to 1.3 parts of a viscous agent, 0.2 to 0.6 part of a dispersing agent and 0.4 to 1part of an antioxidant. The invention also discloses a preparation method of the wear-resistant ecological environment-friendly lubricating oil. The wear-resistant ecological environment-friendly lubricating oil disclosed by the invention is good in lubricating effect, good in compression resistance and wear resistance, excellent in stability and safe and environment-friendly to use.

The invention discloses a preparation method for a fruit green ceramic handicraft. The preparation method comprises the following steps: weighing potassium dichromate, silicon-containing polycarbonate resin, calcium oxide, nanometer silicon boride, calcium boride, calcium carbonate, a fluorine-containing additive and AS resin in proportion, carrying out uniform mixing and levigation, then adding polypropylene fiber, carrying out uniform mixing, calcining the obtained mixture in a kiln, then crushing the calcined mixture, rinsing the crushed mixture until no yellow water comes out, then carrying out processing and levigation, placing the obtained powder into a double screw extruder for extrusion and granulation, carrying out crushing after granulation and then carrying out processing and levigation so as to obtain a colorant; weighing the colorant and lime glaze according to mass fractions, diluting the colorant, then sieving the colorant with a 250-mesh sieve, and sieving the lime glaze with a sieve with a size of 200 to 250 meshes so as to obtain a glaze; and glazing a ceramic handicraft having undergone briscuit firing and calcining the glazed ceramic handicraft in the kiln so as to obtain the fruit green ceramic handicraft. The glaze layer of the handicraft obtained in the invention is clear, transparent, uniform in color and good in glossiness, and has a bright and active color and excellent stability, wear resistance and corrosion resistance.

The invention discloses a high-abrasion-resistance anti-scouring ceramic seal ring. The ceramic seal ring is prepared from the following raw materials of, by weight, 80-90 parts of aluminum oxide, 3-5 parts of copper oxide, 5-10 parts of nickel iron powder FeNi80, 3-5 parts of silicon boride, 0.5-1 part of nanometer titanium dioxide P25, 0.1-0.2 part of nanosilica, 0.3-0.5 part of hydroxyethyl cellulose, 0.3-0.5 of sodium silicate, 0.15-0.25 part of titanate coupling agent TMC-201, 6-8 parts of sodium hydroxide, 0.05-0.1 part of polysorbate-80 and 0.1-0.2 part of alcohol-soluble phenolic resin. The ceramic seal ring is good in corrosion resistance, long in service life, and good in anti-scouring performance and has good stability and durability and high abrasion resistance, and the impact resistance and crack resistance are improved.

The invention provides a multi-layer ceramic-based composite thermal protection coating and a preparation method and an application thereof, and the multi-layer composite thermal protection coating is prepared by a combined process of preparing three layers by a chemical vapor deposition method and preparing two layers by a brushing sintering method, and the coating sequentially comprises a buffer layer, a high-strength self-healing anti-oxidation layer, a middle chemical barrier layer, a ceramic thermal insulation layer and a reinforced isolation layer from inside to outside. The inner buffer layer, the middle chemical barrier layer and the outer reinforced isolation layer are all made of chemical vapor deposition silicon carbide; the strong self-healing anti-oxidation layer of the secondary inner layer is made of silicon powder/zirconium silicide/silicon hexaboride multiphase ceramic; and the material of the ceramic thermal insulation layer on the secondary outer layer is silicon powder/lanthanum hexaboride/mullite/zirconium boride multiphase ceramic. The composite material has excellent thermal protection performance such as oxidation resistance, corrosion resistance and thermal shock resistance, the service life of the material under high-temperature chemical oxidation and corrosion conditions can be remarkably prolonged, and the ceramic-based or carbon-based composite material keeps stable comprehensive performance after being recycled for multiple weeks in the high-temperature environment of 1,500 K or above.

The invention discloses an aluminium nitride-based multi-element nano-composite ceramic die material and a preparation method thereof. The material comprises the following raw materials in parts by weight: 60-80 parts of aluminium nitride, 10-20 parts of aluminium carbide, 15-25 parts of silicon boride, 2-6 parts of scandium oxide, 4-8 parts of neodymium oxide, 2-4 parts of chromium, 1-3 parts of tungsten and 1-3 parts of nickel, wherein nanoscale powder of all the materials is adopted; the grain size of aluminium nitride is 10-100 nanometers; the grain sizes of aluminium carbide and silicon boride are 1-10 nanometers; the grain sizes of the other raw materials are 1-100 nanometers. The preparation method is characterized by using aluminium nitride as the matrix, adding aluminium carbide and silicon boride as reinforcing phases, scandium oxide and neodymium oxide as stabilizing agents and chromium, tungsten and nickel as sintering aids and carrying out hot pressed sintering on the materials, thus preparing the material. A die has strong ageing and defect resistance, good comprehensive mechanical properties and excellent antifriction and wear resistance properties.

The invention discloses a high impact resistant ceramic ware and a preparation method thereof. The high impact resistant ceramic ware is prepared from the following raw materials by weight part: 25-37 of quartzite, 18-26 of germanite, 12-19 of garnet, 22-34 of nacrite, 8-16 of opal, 10-15 of attapulgite, 14-22 of silicon boride, 12-18 of barium molybdate, 10-15 of glass fiber, 4-8 of cobalt chromium tungsten alloy powder, 2-3 of sodium stearate, 4-6 of calcium gluconate, 6-9 of nano-antibacterial powder. The ceramic ware provided by the invention is added with boron silicon, cobalt chromium tungsten alloy powder, barium molybdate, glass fiber and other raw materials to enhance the mechanical properties and improve the impact resistance, and has very high hardness and good strength, so that the ceramic ware is not easy to break under external force impact, is durable, and can produce enormous economic benefits.

The invention belongs to the technical field of refractory materials, and provides silicon carbide powder and a preparation method thereof. The silicon carbide powder includes, by weight, 35-60 partsof silicon carbide coarse powder; 4-15 parts of silica fume, 1-5 parts of carbon powder, 2-7 parts of titanium dioxide, 1-5 parts of zirconium oxide, 2 to 6 parts of polyhedral oligomeric silsesquioxane, 0.5-1 part of molybdenum carbide, 0.5-1 part of silicon boride, 0.5-1.5 parts of erbium acetate, 0.5-1.5 parts of yttrium oxide, 0.7-3 parts of polyethylene glycol, 0.5-2 parts of poloxamer, 0.3-1part of sodium tripolyphosphate and 0.5-2 parts of a dispersing agent. In the preparation method, a step-by-step mixing and twice ball milling combined manner is adopted. Through the technical scheme, the problems of low strength and poor thermal shock stability of a silicon carbide plate caused by easy agglomeration when the silicon carbide plate is fired by the silicon carbide powder in the prior art are solved.

The invention discloses a wear-resistant lining plate of a bucket wheel machine hopper and a manufacturing method thereof. The lining plate comprises the following components in percentage by weight:0.5-0.8% of C, 0.1-0.3% of Ge, 1.5%-2.0% of Mn, 0.05%-0.1% of Tc, 0.2%-0.5% of Cu, 0.4%-0.8% of Zr, 0.05%-0.08% of Ta, 0.01%-0.03% of Y, 0.02%-0.04% of Ho, 0.05%-0.1% of silicon boride, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance Fe. The manufactured wear-resistant lining plate has the advantages of higher hardness, wear resistance, impact toughness and fatigue strength, and can effectively improve the ball milling efficiency.

The invention discloses a furan resin laminating core sand for train component casting and a preparing method of the furan resin laminating core sand. The furan resin laminating core sand is prepared from, by weight, 140-160 parts of fused magnesite, 30-40 parts of chromite sand, 20-30 parts of ceramsite sand, 14-16 parts of glass pumice, 3-5 parts of furan resin, 0.5-0.7 part of molecular distillation monoglyceride, 2-4 parts of aluminophosphite, 3-5 parts of calcium stearate, 8-10 parts of spherical quartz powder, 3-5 parts of nanometer tungsten oxide, 5-7 parts of silicon boride and the like. According to the furan resin laminating core sand, the furan resin, the aluminophosphite, tri (4-hydroxyphenyl) methane glycidyl ether and triethylene tetramine are added for providing good caking property and solidification effect for the core sand, a resin curing agent prepared from toluenesulfonic acid and methyl sulfate is used for shortening resin hardening time, the concentration of formaldehyde in air in an operation area is reduced, and the health of workers is facilitated; under the joint effect of a furan resin binder and the curing agent, the strength of the self-hardening sand is improved; and in addition, as the addition of lubricating agents including the calcium stearate and the molecular distillation monoglyceride, the breathability of the core sand is improved, and the gas-forming amount is reduced.