185 results about "Diboride" patented technology

A press plate for producing decorative laminate from resin impregnated paper, with alumina particles on its pressing surface, is coated with diborides selected from the group consisting of hafnium diboride, molybdenum diboride, tantalum diboride, titanium diboride, tungsten diboride, vanadium diboride, or zirconium diboride or mixtures thereof for making the press plate resistant to scratching. The preferred diborides are titanium and zirconium. The most preferred diboride is titanium. The color, gloss and surface appearance of laminate pressed with a titanium diboride coated press plate is substantially the same as laminate pressed with the press plate before coating.

Semiconductor structures are provided comprising a substrate and a epitaxial layer formed over the substrate, wherein the epitaxial layer comprises B; and one or more element selected from the group consisting of Zr, Hf and Al and has a thickness greater than 50 nm. Further, methods for integrating Group III nitrides onto a substrate comprising, forming an epitaxial buffer layer of a diboride of Zr, Hf, Al, or mixtures thereof, over a substrate; and forming a Group III nitride layer over the buffer layer, are provided which serve to thermally decouple the buffer layer from the underlying substrate, thereby greatly reducing the strain induced in the semiconductor structures upon fabrication and/or operation.

The present invention relates to CBN briquetting which contains CBN and matrix phase, the matrix phase combines with a second horniness phase and maximum titanium diboride, thereinto, the second horniness phase is selected from TiCN, TiC, TiN or its mixture and solid solution, the XRD peak height of thetitanium diboride peak (101)(after back ground emendation) is below 12 percent of the CBN peak (111) height.

The invention relates to a ceramic product for daily use, and particularly relates to a ceramic product containing nano attapulgite for daily use and a fabrication technology thereof. The ceramic product is prepared from the following raw materials in parts by weight: 50-55 parts of natural clay, 20-23 parts of kaolin clinker, 12-14 parts of potash feldspar, 5-6 parts of dolomite, 2-3 parts of ammonium alum, 40-45 parts of kaolin, 1-2 parts of zirconium dioxide, 10-15 parts of nano attapulgite, 3-5 parts of nanometer titania, 1-2 parts of tantalum diboride, 1-2 parts of vanadium boride and 5-6 parts of assistant. The unique properties of the nano materials such as the nano attapulgite, nanometer titania and the like are utilized, so that the sintering temperature is reduced, and the production energy consumption is reduced; by combining with other raw materials, the finally prepared product has good whiteness and glossiness, and is tight in glaze adhesion, uniform in color and luster, non-toxic and harmless, beautiful and durable, and wide in application range, and the shock resistance is improved.

The invention discloses a preparation method of a high-strength silicon carbide porous ceramic. Raw materials are composed of 98%-99% of mixture of alpha-silicon carbide powder and beta-silicon carbide powder, 0.1%-1.0% of aluminum diboride and 0.5%-1% of polycarbosilane, by weight percent. The method comprises the following steps: 1) adding the raw materials into an organic dispersing solvent, ball-milling, mixing and drying; 2) dry-pressing and forming the obtained silicon carbide compound powder under the 45-55 MPa; and 3) placing a silicon carbide blank into a vacuum pressure-less sintering furnace, for sintering at two steps, thereby obtaining the high-strength silicon carbide porous ceramic. The preparation method is simple and the prepared silicon carbide porous ceramic is characterized by high mechanical strength, suitable porosity, and the like.

The invention provides a method for preparing a titanium-diboride-based ceramic composite material in order to solve problems existing in an existing method for preparing the titanium-diboride-based ceramic composite material, and belongs to the technical field of materials. The method includes the following steps that (1) TiB2 powder is evenly mixed with a carbon source and screened, and particles with the particle size ranging from 24 meshes to 60 meshes are selected as mould pressing materials; (2) the mould pressing materials are subjected to mould pressing and dried to obtain a TiB2-based biscuit; (3) the TiB2-based biscuit serves as a framework, Si is adopted as an infiltration agent for vacuum infiltration. The method is simple in step and low in temperature requirement, the titanium-diboride-based ceramic composite material high in compactness can be obtained under the condition that preparing cost is low, and the size change of a sample in the preparing process is smaller than 0.1%, so that the method belongs to net-size sintering. Besides, the method can be used for producing products in various complex shapes.

Osmium, when combined with boron alone, or in combination with rhenium, ruthenium or iron, produces compounds that are ultra-hard and incompressible. These osmium diboride compounds are useful as a substitute to for other super or ultra-hard materials that are used in cutting tools and as abrasives. The osmium diboride compounds have the formula

Os_xM_1-xB₂

where M is rhenium, ruthenium or iron and x is from 0.01 to 1, except when x is not 1 and M is rhenium, x is from 0.01 to 0.3.

The present invention relates to a technique for preparing a titanium diboride (TiB2) coating on a metal surface. In the technique, advantages of a plasma spraying technique and a laser remelting technique are combined, defects such as poor thermal shock resistance and bad compactness of the TiB2 coating obtained by the plasma spraying technique are overcome, and problems that fusion covering of a boride is difficult by a laser fusion covering technique and the coating is large in stress and poor in uniformity are solved. A layer of TiB2 coating is prefabricated on a metal matrix through the laser spraying technique, a porosity factor of the coating is controlled through technological parameters, and then laser remelting treatment is performed on the coating, thus to obtain a dense TiB2 coating in metallurgical bonding with the matrix on the metal surface. With adoption of the obtained TiB2 coating, the surface strength of the metal matrix and the service time of the metal matrix in a corrosive environment can be notably raised.

A semiconductor apparatus includes a substrate made of a diboride single crystal expressed by a chemical formula XB₂, in which X includes at least one of Tl, Zr, Nb and Hf, a semiconductor buffer layer formed on a principal surface of the substrate and made of Al_yGa_1-yN (0<y≦1), and a nitride semiconductor layer which is formed on the semiconductor buffer layer and which includes at least one kind or plural kinds selected from among 13 group elements and As.

The invention relates to a preparation method of a titanium diboride-nickel coating or film. By using the method, a metal Ni toughened TiB2 coating or film is prepared through in-situ synthesis; and the coating has hardness up to higher than 25GPa, good conductive properties, good toughness, corrosion resistance and erosion resistance, and excellent friction and wear performance, and can be widely applied to the fields of cutting tool, mold, electric contact and protection. The preparation process has advantages of simpleness, short production cycle and low cost, and is convenient for industrialized mass production.

The invention belongs to the field of surface protection technologies and related coating technologies and discloses a titanium-diboride-zirconium-diboride coating of a periodic multilayer structure and a preparation method and application of the titanium-diboride-zirconium-diboride coating. With titanium diboride ceramic targets and zirconium diboride ceramic targets as raw materials, the coating is formed by periodically superposing titanium diboride nanometer ceramic layers and zirconium diboride nanometer ceramic layers on a base body in an alternative sputtering deposition manner by means of multi-target magnetic control sputtering. According to the coating, due to the fact that the nanometer multilayer structure is introduced, the frictional coefficient of a multilayer film is lower than the frictional coefficient of two single layers, and the coefficient of friction between the multilayer film and a GCr15 steel ball is lower than 0.30, so that the excellent wear resistance is presented, and the titanium-diboride-zirconium-diboride coating can be used as a protection coating for engineering application occasions needing the high hardness and high wear resistance, such as protection of surfaces of products of mechanical parts, knife dies and the like. The titanium-diboride-zirconium-diboride coating is convenient to operate, simple in process, short in manufacturing period, low in cost and capable of facilitating large-scale industrial production.

The invention discloses a preparation method of a binary tungsten boride superhard material, which comprises: by adopting a mechanical alloy method and utilizing high-energy ball milling, in the argon shield atmosphere, using high purity tungsten powder and boron powder as raw materials to directly synthesize tungsten diboride powder in a powder state under room temperature, and then carrying out thermal processing on the synthetic powder to prepare a tungsten tetraboride material. The preparation method disclosed by the invention is simple and convenient in preparation process and high in controllability, adopts atmosphere sintering in the sintering stage, has no other special requirements for equipment, and is high in universality.

A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m^1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B₄C powder, a TiO₂ powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 μm. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB₂ in B₄C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 μm, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 μm to boron carbide particles having a particle diameter of at most 5 μm, is from 0.02 to 0.6.

The present invention relates to CBN briquetting which contains CBN and matrix phase, the matrix phase combines with a second horniness phase and maximum titanium diboride, thereinto, the second horniness phase is selected from TiCN, TiC, TiN or its mixture and solid solution, the XRD peak height of thetitanium diboride peak (101)(after back ground emendation) is below 12 percent of the CBN peak (111) height.

A proton exchange membrane fuel cell is described and which includes a proton exchange membrane having at least one gas diffusion layer which is juxtaposed relative thereto, and which is fabricated, at least in part, of a porous, electrically conductive, inorganic material which is selected from the group comprising metal diborides, metal disilicides, metal nitrides, metal carbides, and composites, laminates and solid solutions thereof.

The invention relates to the field of ceramic materials, in particular to a silicon carbide ceramic and a preparation method thereof. The preparation method of the silicon carbide ceramic provided bythe invention comprises the following steps: step one, mixing silicon carbide powder, aluminum oxide powder and Re2O3 powder to obtain silicon carbide-aluminum oxide-Re2O3 mixed powder; step two, mixing the silicon carbide-aluminum oxide-Re2O3 mixed powder with tantalum diboride powder to obtain silicon carbide-aluminum oxide-Re2O3-tantalum diboride mixed powder; and step three, pelleting and sintering the silicon carbide-aluminum oxide-Re2O3-tantalum diboride mixed powder to obtain the silicon carbide ceramic. The silicon carbide ceramic solves the technical problem that the oxidation resistance is reduced due to the fact that a silicon dioxide protective film generated after a liquid-phase sintered silicon carbide ceramic is oxidized in the prior art is broken. The silicon carbide ceramic obtained by the method is high in compactness and high in oxidation resistance, and can be widely applied to the fields of mechanical engineering, chemical engineering, micro-electronics, automobiles, petroleum, processing and the like.

The present invention discloses a vehicle plastic, which comprises the following raw materials: a nylon 6 material, graphene, titanium dioxide, zirconium silicate, a terpene resin, polytetrafluoroethylene, dibutyl phthalate, poly aluminium chloride, acrylamide, aluminum nitrate, a petroleum resin, polyethylene wax, chlorosulfonated polyethylene, calcium stearate, ultra low density polyethylene and an auxiliary agent, wherein the auxiliary agent is prepared from the following raw materials: clay, sepiolite powder, vermiculite powder, 1,6 hexanediol diacrylate, montmorillonite powder, sodium carbonate, sodium fluorosilicate, silver nitrate, vanadium diboride, clove oil, regular fused alumina powder, and a silane coupling agent. According to the present invention, the lightweight polyolefin is used to modify the nylon material, such that the performance of the traditional nylon material is improved, the obtained can be adapted to the specific use environment, has good processability and good mechanical property, and further has characteristics of high hardness, oxidation aging resistance, heat aging resistance, water resistance, oil resistance, static electricity resistance, and safe use.

The invention provides a preparation method of a polysilicate diboride flocculant, in the technical scheme, the following substances are adopted as the raw materials by the 100 mass parts of the polysilicate diboride flocculant: 1 to 20 parts of alkali metal silicate, 1 to 8 parts of zinc salt, 1 to 6 parts of aluminum salt and 1 to 4 parts of organic boric acid ester; the preparation method comprises the following preparation steps that: (1) water respectively prepares the alkali metal silicate, the aluminum salt and the zinc salt into 1 to 40 weight percent of solution; (2) acid is used for regulating the pH value of the alkali metal silicate solution which is prepared in step (1) to be less than 6 or more than 10, the reaction temperature is regulated to be 0 to 60DEG C, polymerization is carried out for 1 to 10h, and aging is carried out for 1 to 24h; and (3) the organic boric acid ester and the zinc salt and the aluminum salt solution which are prepared in step (1) are added into an aged sample in step (2), the reaction temperature is regulated to be 0 to 60DEG C, and the materials react for 1 to 10h and stay still for 2 to 24h. The polysilicate diboride flocculant has excellent turbidity flocculation effect and oil removing effect, and can simultaneously improve the stable storage performance.

The invention discloses a titanium diboride reinforced CuW alloy in-situ synthesis method. The method comprises the steps of evenly mixing W powder, B powder and induced copper powder and conducting compression molding on the mixture to obtain a tungsten compact; putting the tungsten compact into an atmosphere sintering furnace for sintering to obtain a tungsten skeleton; putting a CuTi alloy on the tungsten compact and then putting the CuTi alloy and the tungsten compact into a graphite crucible paved with graphite paper, conducting infiltration in the sintering furnace to obtain the in-situsynthesis titanium diboride reinforced CuW alloy. According to the method, a ceramic phase TiB2 is generated in a CuW material in situ through the sintering-filtration method. In the presence of the low-work-function ceramic phase, electric arcs are effectively dispersed, so that the electric arc ablation resistance of a CuW contact material is improved.

The invention discloses a molybdenum-cobalt-boron ternary boride base metal ceramic material and a preparation method thereof. The process comprises the following steps: simple-substance molybdenum powder, cobalt powder and boron powder are used raw materials for ball-mill mixing, drying, formation and sintering to prepare ternary boride base metal ceramic; a main phase is a MoCoB type diboride with an orthorhombic structure; contained hard phases are two similarly stable MoCoB phases; and bonded phases are Co or CoB compounds or solid solution of the two. The boron content (the atomic ratio B/Mo is more than 1.1) is increased in the ratio; the liquid phase appearance temperature of a ternary system is reduced; the sintering temperature is reduced; the preparation process is simplified; the cost is reduced; more excellent phase structures can be obtained through low-temperature sintering; and the oriented growth of grains is prevented. The Rockwell hardness is not lower than 83.5 HRA.The material can serve as cutting tool and mold structures and structural part or wear resisting part materials, improves the toughness, the hardness and the wear resistance of metal, and is high in oxidation resistance and stable in chemical property.