245 results about "Polysilazane" patented technology

The invention belongs to the technical field of nanofiltration, and provides a preparation method of a recrystallized silicon carbide-silicon carbonitride ceramic membrane. The preparation method comprises the following steps: applying a polysilazane solution to a porous substrate for the first time, and then performing first pyrolysis to obtain a pyrolysis material; and applying a polysilazane solution on the pyrolysis material for the second time, and then carrying out second pyrolysis to obtain the recrystallized silicon carbide-silicon carbonitride ceramic membrane. According to the invention, a solution containing propargyl polysilazane or organic polysilazane Durazane 1500 quick-drying resin is used as a precursor to prepare the ceramic membrane, and the ceramic membrane has the advantages of high ceramic yield, excellent high-temperature stability, high retention rate and controllable microstructure, and is suitable for separation and protection application in extreme environments.

The invention belongs to the technical field of protective coatings, and particularly relates to a modified polysilazane-based protective coating, a preparation method thereof, a protective coating and application thereof. The modified polysilazane-based protective coating provided by the invention is prepared from the following preparation raw materials in parts by mass: 5.0 to 15.0 parts of polysilazane, 1.0 to 5.0 parts of a low-surface-energy compound, 1.0 to 5.0 parts of a hydrophilic compound, 1.0 to 5.0 parts of a silane coupling agent, 0.01 to 0.1 part of an initiator and 60.0 to 80.0 parts of a dispersion medium, both the low-surface-energy compound and the hydrophilic compound contain groups for free radical polymerization reaction. A protective coating formed by the protective paint provided by the invention has good environmental adaptability, and can simultaneously realize multiple effects of friction resistance, corrosion resistance, adhesion resistance, biological fouling resistance and the like when used under harsh working conditions (air / underwater environment).

The invention discloses a high-temperature-resistant high-stripping organic silicon pressure-sensitive adhesive and a preparation method thereof, and relates to a pressure-sensitive adhesive and a preparation method thereof. The invention aims to solve the problems of insufficient temperature resistance, low peel strength and poor binding force with a base material of the existing organic silicon pressure-sensitive adhesive. According to the invention, phenyl siloxane rubber, hydroxyl-terminated polysiloxane and methyl vinyl MQ silicon resin are used as basic raw materials, and polysilazane is used as a heat-resistant modifier to carry out heat-resistant modification on the chemical structure of the pressure-sensitive adhesive; a trifunctional allyl silane monomer is added in the film preparation process, so that the crosslinking density of the system is improved, and the heat resistance of the pressure-sensitive adhesive is further improved; the bonding force between the pressure-sensitive adhesive and a polyimide substrate is improved by adding the peroxysilane coupling agent, and the use of a primer in the coating process is omitted; by adding the hydroxyl MQ silicon resin and the phosphate adhesion promoter, the bonding strength of the pressure-sensitive adhesive is improved, and the high-temperature-resistant and high-stripping organic silicon pressure-sensitive adhesive is prepared. According to the invention, the high-temperature-resistant and high-stripping organic silicon pressure-sensitive adhesive can be obtained.

The invention discloses a water-based poly-ceramic coating material as well as a preparation method and application thereof. The formula comprises a composite base material (40-45 parts of modified waterborne polyurethane resin and 15-20 parts of a waterborne acrylic emulsion), a synergistic curing system (10-12 parts of a blocked isocyanate curing agent and 0.8-1.2 parts of a latent organic zinc salt accelerant), an organic-inorganic reinforced phase (10-15 parts of nano silicon dioxide and 8-10 parts of polysilazane) and a functional aid. The base material and the cosolvent cooperate to make VOCs less than or equal to 30 g / L, a curing system cooperates to realize low-temperature rapid curing, organic-inorganic components cooperate to form a poly-ceramic structure, the coating is adaptive to an existing roll aluminum production line, and the problems of environmental protection, energy conservation and performance of a traditional coating are solved.

The invention relates to the technical field of aerogel composite materials, and discloses an aerogel composite fiber material and a preparation method and application thereof.The aerogel composite fiber material comprises, by weight, 15-50% of polysilazane fibers and 50-85% of a silicon dioxide aerogel matrix, the polysilazane fibers and the silicon dioxide aerogel matrix are connected through Si-O-Si chemical bonding, and an inert passivation layer is arranged at the interface of the two. The preparation method comprises the following steps: immersing the polysilazane fiber in silicon source precursor sol to carry out in-situ catalytic gelation; carrying out gas phase treatment on the obtained alcogel composite material, and forming an inert passivation layer on the surface of the fiber by utilizing a generated by-product; and carrying out normal-pressure drying on the composite material subjected to gas phase treatment. Through in-situ catalysis and interface self-passivation design, the interface bonding strength and the mechanical property of the material are remarkably enhanced, normal-pressure drying of the material is achieved through gas phase treatment, the process is simplified, and the production cost is reduced.

The invention relates to the technical field of ceramic materials, and discloses a nitrogen-rich Si-Zr-N precursor, a nitrogen-rich amorphous SiZrN ceramic preparation method and a nitrogen-rich Si-Zr-N. The preparation method comprises the following steps: mixing perhydropolysilazane and tetrakis (dicarboxamide) zirconium, and then carrying out low-temperature liquid ammonia crosslinking and room-temperature ammonification to obtain the nitrogen-rich Si-Zr-N precursor. According to the preparation method of the nitrogen-rich amorphous SiZrN ceramic, high-temperature ammonolysis is carried out on a nitrogen-rich Si-Zr-N precursor, and the nitrogen-rich amorphous SiZrN ceramic is obtained. According to the invention, the nitrogen content of the precursor is increased through the molecular-level structure design, so that the formation of the high-nitrogen-ratio amorphous ceramic is facilitated; the pyrolysis path can be regulated and controlled, the product structure is compact, the components are uniform, and the problem of uneven mixing or incomplete reaction in the traditional method is avoided; the precursor is high in universality, is suitable for various processing and pyrolysis modes, and has good application expansibility; the cost is controllable and the method is environment-friendly.

The invention relates to a ceramic composite diaphragm as well as a manufacturing method and application thereof. The method for manufacturing the ceramic composite diaphragm comprises the following steps: (1) mixing at least two of a rare earth oxide, a metal organic framework material and glass powder, polysilazane resin and an organic solvent to obtain precursor slurry, the polysilazane resin comprising hyperbranched polysilazane resin; (2) performing electrostatic spinning on the precursor slurry to obtain a precursor film; and (3) sequentially carrying out ultraviolet light crosslinking, plasma treatment and curing treatment on the precursor membrane to obtain the ceramic composite diaphragm.

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-strength special ceramic and a preparation method thereof. The high-strength special ceramic is prepared from the following raw materials: alumina powder, quartz powder, serpentine, phosphorus slag, eucryptite, barium borate, nano yttrium trifluoride, nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane. According to the high-strength special ceramic disclosed by the invention, the aluminum oxide powder, the quartz powder, the serpentine and the phosphorus slag are taken as matrix raw materials, eucryptite, barium borate and yttrium trifluoride are taken as fluxing agents, and nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane are taken as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness.

The invention relates to a fully-degradable PLA composite material with ceramic characteristics and a preparation method thereof. The fully-degradable PLA composite material is prepared from the following raw materials in percentage by weight: 25-45% of PLA, 5-13% of PBS, 48-60% of a filling agent and the balance of a processing aid, the filler is obtained by modifying an inorganic filler through a modifier; the modifier is prepared from methyl hydrogen-containing polysilazane and a bio-based maleic anhydride graft; the bio-based maleic anhydride graft is a composition of one or more of maleic anhydride grafted poly (butylene adipate-co-terephthalate), maleic anhydride grafted polyvinyl alcohol and octenyl succinic anhydride modified starch. Through the synergistic effect of the inorganic components of the filling agent, the proportion of PLA / PBS and the modifier, the filling agent has the advantages that the filling effect is good; the material is matched with the use requirement of the ceramic flying saucer on key indexes, and all components have bio-based or degradable characteristics, so that the dual targets of'ceramic performance bionics' and'environment-friendly controllable degradation 'are achieved.

The present invention belongs to the technical field of functional films, and particularly relates to a UV-protection PVB composite film, a preparation method therefor, and the use thereof. The UV-protection PVB composite film comprises an EVA / PVB composite film formed by an EVA film and a PVB film, wherein an ultraviolet light conversion layer is provided between the EVA film and the PVB film, the EVA film contains an ultraviolet light conversion agent, the PVB film contains an ultraviolet light absorber, and the ultraviolet light conversion layer is formed by coating with a transparent ultraviolet light conversion coating, and contains the ultraviolet light conversion agent, perhydropolysilazane, α-Al2O3 and a solvent. The ultrathin inorganic ultraviolet light conversion layer is designed which uses the perhydropolysilazane as a film-forming substance and the α-Al2O3 as a dispersion aid, and therefore exhibits excellent dispersibility, transparency and durability, thus reducing the use amount of light conversion agents, improving the light conversion efficiency, and solving the problem that light conversion agents added to EVA films are difficult to disperse and thus cannot achieve effective light conversion.

The invention provides an insulating high-thermal-conductivity flexible silica gel sheet and a preparation method thereof. The silica gel sheet comprises the following components in parts by weight: 1-5 parts of organic boride; 1 to 5 parts of a polysilazane compound; 1-5 parts of hydrogen-containing silicone oil; 5 to 10 parts of dimethyl silicone oil; 20 to 30 parts of vinyl silicone oil; 50-80 parts of a heat-conducting filler; 0.01 to 0.1 part of a platinum catalyst; the heat-conducting filler comprises a heat-conducting filler 1 and a heat-conducting filler 2, the heat-conducting filler 1 is selected from any one of boron nitride, aluminum oxide and magnesium oxide, and the heat-conducting filler 2 is selected from any one of graphene, silicon carbide and silicon nitride. The flexible silica gel sheet provided by the invention realizes comprehensive optimization of high heat-conducting property, excellent electrical insulating property, thermal mechanical stability and surface flatness.

The invention discloses a weather-resistant pearlescent pigment and a preparation method thereof. The weather-resistant pearlescent pigment comprises a pearlescent pigment of which the outer surface is coated with a protective layer, the main component of the protective layer is silicon dioxide, and the protective layer is combined with the pigment substrate in a covalent bond form; and the protective layer is formed by curing polysilazane. The invention also discloses a color coating composition containing the weather-resistant pearlescent pigment, a cured coating, and a glass panel and a photovoltaic module containing the cured coating. According to the weather-resistant pearlescent pigment, a high-hardness silicon dioxide protection layer is formed on the surface of a common pearlescent pigment, and the weather resistance of the pearlescent pigment is remarkably improved.

The invention discloses low-gas-evolution and high-heat-resistance precoated sand and a preparation method thereof, and relates to the technical field of casting materials.The preparation method comprises the following steps that cast steel reclaimed sand is dried, so that the water content of the cast steel reclaimed sand is reduced to 0.1% or below; taking 1000 parts by weight of treated cast steel reclaimed sand, adding 5-10 parts by weight of a silane coupling agent, and uniformly mixing; the mixed materials are heated to 75-80 DEG C and then transferred into a sand mixer, 30-40 parts by weight of organic polysilazane resin is added, and sand mixing is conducted; adding 6-8 parts by weight of carbon nanotube powder, and mixing for 30 seconds; sequentially adding 5-7 parts by weight of vinyl silicone oil and 1.8-2.4 parts by weight of calcium stearate, and uniformly mixing to obtain a precoated sand product. According to the present invention, the novel bonding system is adopted to prepare the sand mold through the low temperature film coating process, and the prepared sand mold can generate ceramic transformation during the casting stage so as to provide characteristics of extremely low gas forming amount, extremely high heat resistance, low thermal expansion rate and excellent casting quality, and the production process has characteristics of energy saving and consumption reducing.

The present disclosure provides a polymer-derived ceramic thin film thermocouple and a preparation method thereof. The polymer-derived ceramic thin film thermocouple comprises an A electrode and a B electrode, wherein one end of the A electrode and one end of the B electrode intersect and overlap to form hot junctions, an end of the A electrode away from the hot junction and the end of the B electrode away from the hot junction are provided with solder joints. Each solder joint may be connected to a lead wire, the lead wire is configured for output a signal; the A electrode is prepared by mixing a polysilazane solution, nanocomposite powder and a xylene solution, and the nanocomposite is prepared by mixing indium oxide nanopowder, zinc oxide powder and anhydrous ethanol; the B electrode is prepared by mixing a polysilazane solution, indium oxide nanopowder, and a xylene solution.

The application belongs to the technical field of inorganic porcelain composite materials, and particularly relates to an inorganic porcelain composite material for resisting salt and nitrate and preventing moisture and a preparation method thereof. The application comprises the following steps: preparation of activated base powder; and sintering of the activated base powder. The application is prepared by sintering a blank body made of calcium carbonate, talcum powder, silicon nitride, quartz sand and perhydrogen polysilazane. The perhydrogen polysilazane is first decomposed to solidify and shrink the blank body. When the temperature continues to rise, the quartz in the blank body and the silicon dioxide generated by the oxidation of the silicon nitride are both in a molten state and are fused with each other. The oxygen in the air penetrates into the blank body by diffusion and reacts with the silicon nitride. At this time, the nitrogen gas generated by the silicon nitride cannot diffuse outward under the molten blank body formed after solidification and shrinkage, and gradually gathers to cause the expansion of the base and a high closed porosity. The prepared inorganic porcelain composite material has excellent moisture resistance and high resistance to salt and nitrate.

The invention relates to the field of nuclear cable manufacturing, in particular to a radiation-resistant cable for a nuclear power platform and a preparation method of the radiation-resistant cable. According to the nuclear cable, the five-layer structural design of conductor-insulation-shielding-polyimide film-sheath is adopted, the overlapping wrapping technology of the polyimide film is combined, and the comprehensive performance of the cable in the extreme environment of a nuclear power platform is comprehensively improved. The low-smoke halogen-free flame-retardant ethylene-propylene rubber is adopted as an insulating material, and through the cooperation of an EPDM / POE blending system and the ternary composite flame retardant, the insulating property is stable under the condition of ensuring radiation, and the flame retardant property is excellent. The sheath material is added with the intumescent flame retardant and the polysilazane modifier, so that the cable has no crack at the low temperature of-40 DEG C, the bending radius can be controlled to be less than 5 times of the outer diameter, and the cable is adaptive to the layout of a narrow cabin. Through the synergistic effect of material innovation and structural design, the balance of flame retardant property, mechanical property, radiation resistance, low temperature resistance, aging resistance and small-space applicability of the nuclear cable is realized.

The invention discloses bi-component high-thermal-conductivity ceramizable liquid silicone rubber. The liquid silicone rubber is prepared from a component A and a component B in a mass ratio of 1: 1, the component A is prepared from the following raw materials in parts by weight: 100 parts of a base material, 5 to 15 parts of a hydrogen-containing silicone oil cross-linking agent, 0.5 to 3 parts of a chain extender, 10 to 20 parts of vinyl modified polysilazane and 0.01 to 0.1 part of an inhibitor; the component B is prepared from the following raw materials in parts by weight: 100 parts of a base material, 10 to 20 parts of vinyl modified polysilazane and 0.5 to 3 parts of a catalyst. The bi-component high-thermal-conductivity ceramizable liquid silicone rubber disclosed by the invention has excellent fluidity, is easy to form, has a high thermal conductivity coefficient (up to 7w / m.k or above), can be encapsulated into extremely small gaps among electronic components, and avoids the situation that heat cannot be dissipated in time due to the existence of the gaps; the reaction is mild, room-temperature curing and high-temperature accelerated curing can be realized, and a silica gel layer cured under a high-temperature condition can form a compact ceramic layer and can bear 1500 DEG C high-temperature long-time baking without cracking and deformation.

The application discloses a high-temperature-resistant silicone sealant and a preparation method thereof. The sealant comprises A component and B component. The A component is prepared from 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 5-40 parts of a filler, 5-10 parts of a hydrogen adsorbent, 1-3 parts of carbon fiber, 5-10 parts of vinyl fluorosilicone oil and 0.5-1 part of a catalyst. The B component is prepared from 100 parts of hydrogen-containing polysilazane resin, 100-500 parts of a diluent, 10-50 parts of a water-removing agent and 20-100 parts of a filler. The sealant contains SiH-NH-SiH structure, can react with alpha, omega-dihydroxypolydimethylsiloxane to generate elastomers, can eliminate excessive water and catalyst in the system through hydrolysis, and can make the generated elastomers have excellent high-temperature resistance and humidity resistance. Meanwhile, the structure can react with hydroxyl groups on the surface of materials, so that the sealant has excellent bonding properties on glass, ceramic and metal materials.

The application belongs to the technical field of nanofiltration, and provides a preparation method of recrystallized silicon carbide-silicon carbon nitride ceramic membrane. The application obtains a pyrolytic material by first applying a polysilazane solution on a porous base and then performing first pyrolysis; and obtains the recrystallized silicon carbide-silicon carbon nitride ceramic membrane by second applying the polysilazane solution on the pyrolytic material and then performing second pyrolysis. The application uses a solution containing propargyl polysilazane or an organic polysilazane Durazane 1500 rapid cure fast-drying resin as a precursor to prepare the ceramic membrane, and the ceramic membrane has high ceramic yield, excellent high-temperature stability, high rejection rate and controllable microstructure, and is suitable for separation and protection applications in extreme environments.

The application discloses a polarization LED device with adjustable light-emitting color and a preparation method thereof. The preparation method comprises the following steps: mixing cesium oleate, erbium oleate, indium acetate, bismuth acetate, silver acetate, benzoyl chloride, dioctyl ether, oleic acid and oleylamine in proportion, then heating to 120-170 DEG C under a nitrogen atmosphere, reacting for 1-5 min, and stopping the reaction; adding a mixed solution of cyclohexane and ethyl acetate into the reaction solution, centrifuging, collecting the precipitate, repeating the operation, obtaining quantum dots, dispersing the quantum dots in cyclohexane to obtain a quantum dot solution; mixing the quantum dot solution with an inorganic polysilazane solution, ultrasonic dispersing, then heating the mixed solution to 70-90 DEG C, stirring and reacting for 10-15 h, so that the inorganic polysilazane is hydrolyzed to form a dense silicon oxide shell, and a slurry is obtained; preparing the slurry into a film, attaching the film to an LED device, and the polarization LED device with adjustable light-emitting color is obtained. The doping concentration is controlled by introducing a bait ion into a double perovskite system and utilizing energy transfer to realize light-emitting color.

This invention discloses a room-temperature curing self-cleaning photocatalytic film based on multi-level interface synergistic enhancement and its preparation method. The method includes: (1) preparing monodisperse TiO2 nanocrystals with controllable lattice strain using a non-equilibrium growth method; (2) constructing a TiO2 / UiO-66-NH2 / rGO ternary Z-type heterojunction photocatalytic material; (3) preparing a two-component room-temperature curing all-inorganic binder system composed of acid-catalyzed silica sol (ACSS) and fluorosilane-modified polysilazane; (4) compounding the heterojunction photocatalytic material with the binder system and adding nano-silica dispersion, and forming a coating liquid by ultrasonic-shear synergistic dispersion; (5) depositing it on a glass substrate using a gradient ultrasonic spraying process, and curing it into a film by room temperature-medium temperature stepwise curing. This invention achieves, for the first time, a fully inorganic self-cleaning film with both ultra-high photocatalytic activity and ultra-long weather resistance under room temperature curing conditions through multi-level interface synergy of ternary heterojunction synergistic photocatalytic enhancement, room temperature curing of two-component inorganic binder, and gradient film-forming structure design. It solves the technical problem of the difficulty in unifying photocatalytic activity, film-forming process, optical performance and service life in the prior art.

The invention relates to the technical field of high polymer materials, in particular to a wear-resistant and high-temperature-resistant nylon material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 20-50 parts of a nylon new material, 50-80 parts of a nylon recycled material, 15-25 parts of wear-resistant and high-temperature-resistant filler, 5-12 parts of a compatilizer and 3-5 parts of a processing aid, the wear-resistant and high-temperature-resistant filler is an inorganic filler containing a film coating layer; the inorganic filler is a mixture of at least two of sepiolite fiber, wollastonite powder and fumed silica; the film coating layer is prepared from aminopropyl heptaisobutyl cage-shaped polysilsesquioxane, methyl vinyl hybrid aryne resin and methyl hydrogen-containing polysilazane. The prepared product can keep stable performance in a long-term high-temperature environment, the abrasion resistance of the material is improved through the effects of hardness improvement, density optimization, interface strengthening and the like, abrasion is effectively reduced under the severe conditions of long-term high temperature, oil containing and the like, and the service life of the material is prolonged.

The application discloses a carbon-copper composite material for a pantograph slide plate and a preparation method thereof. The carbon-copper composite material is prepared from the following components in percentage by mass: copper powder 65-68%, chromium powder 3-5%, tin powder 1-3%, titanium powder 1-3%, ultra-fine particle size calcined coke 10-13%, carbon fiber powder 9-11% and polysilazane resin 3-5%. The product prepared by the application has good self-lubricity and low resistivity, has good compressive strength, can maintain a long service life in a salt spray area environment, and has good economic prospects.

This invention discloses a modified polysilazane, a two-component silicone sealant, and a method for preparing the same. The modified polysilazane is prepared through a nucleophilic substitution reaction of dimethyldichlorosilane, vinyltrichlorosilane, and ethylenediamine. The two-component silicone sealant prepared using the modified polysilazane of this invention significantly improves its hardness under sealed conditions without adversely affecting its curing and performance. Furthermore, it requires a small amount and is highly practical. The two-component silicone sealant prepared using the modified polysilazane of this invention exhibits high hardness retention under sealed conditions, significantly slows down the reversion phenomenon, and maintains good mechanical properties and adhesion even after curing at 90°C under sealed conditions. It also demonstrates excellent resistance to reversion under fully sealed conditions.

The invention discloses a polysilazane nano composite coating and a method for treating the surface of a mold. The polysilazane nano composite coating comprises the following components: polysilazane resin, nano aluminum oxide, nano silicon oxide, nano boron nitride, a dispersing agent, a flatting agent, a defoaming agent and a solvent. The method comprises the following steps: spraying a polysilazane nano composite coating on the surface of a mold; the mold is placed at the temperature of 140-160 DEG C to be baked for 15-20 min, and then the mold is heated to 240-260 DEG C to be baked for 30-60 min. The problems of pollution, high cost, poor coverage, easiness in stripping and the like existing in an existing mold surface treatment technology are solved.

A method is provided for producing a modified polysilazane-cured coating that densifies a coating made of a polysilazane compound in a short period of time. This method provides a coating having a sufficiently low water vapor transmission rate in a short period of time. Additionally, this method provides a modified polysilazane-cured coating. To cure the coating containing polysilazane, it is irradiated with vacuum ultraviolet (VUV) light at an intensity within a specific range. The method includes a step of applying a base material containing the polysilazane compound represented by formula (1) to form a coating and irradiating the coating with Xe excimer light to modify the polysilazane compound and form a cured coating of the modified polysilazane compound. The illuminance of the Xe excimer light in the curing step is set to a range of 280 to 450 mW / cm2.

The invention relates to the field of aluminum-nickel-cobalt magnet preparation, in particular to an aluminum-nickel-cobalt magnet and a preparation method thereof. Comprising the following steps of melt-spinning, hydrogen demolishing and grinding, compression molding, sintering processing and phosphating treatment, wherein corrosion-resistant components comprise methyl vinyl silazane and polysilazane resin; the phosphating solution comprises the following components in concentration: 30-100 g / L of monopotassium phosphate, 100-200 g / L of phosphoric acid and 5-10 g / L of manganous nitrate; the temperature range of the high-temperature phosphating treatment is 85-98 DEG C. The silicon nitride ceramic is generated by sintering the corrosion-resistant components, so that the corrosion resistance of the aluminum-nickel-cobalt magnet added with Tb and Dy is improved; meanwhile, the sintered aluminum-nickel-cobalt magnet is subjected to phosphating treatment, a phosphating film with high adhesive force is generated through potassium ions in a phosphating solution and silicon nitride ceramic at a high temperature, the corrosion resistance of the aluminum-nickel-cobalt magnet is further improved, and therefore the aluminum-nickel-cobalt magnet is prepared.

The invention relates to the technical field of liquid silicone rubber, and particularly discloses a wear-resistant liquid silicone rubber composite material and a preparation method thereof. The composite material comprises a component A and a component B, wherein the component A comprises vinyl-terminated silicone oil, nano aluminum oxide double-modified by a polyhydroxy polymer and a vinyl silane coupling agent, and a platinum catalyst; the component B comprises vinyl-terminated silicone oil, hydrogen-containing silicone oil, an inhibitor and active polysilazane, the active polysilazane is modified polysilazane containing vinyl or epoxy group, and the active group of the active polysilazane can chemically react with the active group on the surface of the modified nano aluminum oxide to form a chemically bonded interface transition layer. According to the invention, through a dual modification strategy and introduction of active polysilazane, a chemically bonded rigid-flexible bicontinuous network structure is constructed, so that the wear resistance of the composite material is improved while excellent tensile strength, tear strength and elongation at break are maintained.

The application discloses a preparation method of a high-strength ceramic diamond grinding head containing polysilazane, and relates to the technical field of abrasive tool manufacturing. The method aims to solve the problems of poor self-sharpening, insufficient heat resistance, weak bonding force, high sintering energy consumption and easy damage to workpieces of traditional metal, resin and conventional ceramic binder diamond grinding heads. The method comprises the following steps: removing impurities from diamond, adding silicon carbide and oxides according to a specific ratio to prepare a precursor, adding a certain mass fraction of modified polysilazane and a dispersing agent, and finally obtaining the grinding head through gradient heating and sectional sintering in a nitrogen atmosphere after pressure forming. The gradient sintering and inert protection can avoid graphitization of the diamond and defects of the blank. The grinding head prepared by the method has high compressive strength, a dense and gap-free bonding interface, excellent Vickers hardness and abrasive holding force.

The application discloses a kind of ultra-high temperature resistant electric wire cable and preparation method, belong to electric wire cable manufacturing technical field.It includes nickel conductor, the inner insulating layer of silica coated on the surface of nickel conductor, the outer insulating layer coated on the outer surface of silica inner insulating layer, inorganic fiber layer woven on the outer surface of outer insulating layer and high temperature resistant coating coated on the surface of inorganic fiber layer.When preparing, first, the inner insulating layer is formed by coating silica paint on the surface of nickel conductor and curing at high temperature of 450-600 DEG C, then, the outer insulating layer with softness is formed by coating the mixture containing polysilazane, aluminum nitride and boron nitride on the surface of inner insulating layer and pre-curing at low temperature of 80-150 DEG C, then, inorganic fiber layer is woven on the outer surface of outer insulating layer and high temperature resistant coating is coated.The electric wire cable of the application can be used in 500-600 DEG C environment for a long time, and has the properties of high temperature resistance, flexible laying and high insulation sealing performance.