46results about How to "Anti-oxidation temperature is high" patented technology

The invention discloses a miniature PVD coat miller cutter for PCB, and a making method thereof. The miniature PVD coat miller cutter for PCB comprises a substrate and one or more layers of a hard and wear-resistant coat deposited on the substrate through a physical vapor deposition process; the hard and wear-resistant coat is an MeCxNyOz coat, Me is one or more of Al, Cr, Ti, Zr, Si, Hf, Nb, Ni, W, Ta, B, V, Y and Cu, and x+y+z is 1; and the total thickness of the one or more layers of the coat on the substrate is 0.1-10mum. The substrate is made by using a cemented carbide material, a ceramet material, a ceramic material, a cubic boron nitride based material or a high-speed steel material. By improving the structure of the PVD coat in the invention, a processing problem that printed circuit boards are difficult to process is overcome, and a problem that the service life of a common miniature milling cutter is short is prolonged.

The invention discloses a method for preparing a zirconium diboride coating and relates to a method for preparing a ceramic coating. The invention aims to solve the problems that a gas circuit needs to be subjected to thermal insulation treatment and the requirement of a gas flowmeter is high by adopting a method for heating ZrCl4 to be higher than a sublimation temperature and introducing the ZrCl4 into a reaction chamber through the flowmeter in the process of preparing ZrB2 through a conventional chemical vapor deposition method. The preparation method comprises the following steps: by using a double-temperature-area heating mode, by taking ZrCl4, BCl3 and H2 as source gases, by taking Ar gas or N2 as carrier gas and protective gas, preparing the zirconium diboride coating by adopting the chemical vapor deposition method. According to the method in the invention, the gas circuit needs no special thermal insulation treatment, and the flow of the ZrCl4 can be controlled through a temperature control method. The method can be used for preparing zirconium diboride coating.

The invention discloses a Mo-based nitride composite hard film and a preparation method, wherein the substrate is coated with nanometer composite hard film that is made of Mo-based metal nitride or nonmetal nitride, the crystallized size of the film is 5-40nm, the thickness of the film is 1-5Mum, the molar percentage between the Mo element and the substitution element in the film is 50 to 94% : 6 to 50%; the preparation method is that: (a) the target material (made of Mo and the substitution) and the substrate are respectively arranged on the cathode and sample table in vacuum room of magnetic control sputtering equipment, the area ratio of the Mo and the substitution in the target material is 1 to 8 : 8 to 1, the distance between the target material and the substrate is 40-80mm; (b) after the vacuum degree in the vacuum room is less than or equal to 8 x 10-4pa and substrate temperature reaches 300 to 500 DEG C, the vacuum room is made to be in the atmosphere of argon and nitrogen mixed gas and 30-130 minutes sputtering is made so as to prepare the Mo-based nitride composite hard film. The invention can widely be used for material protection and can improve abradability and durability of material obviously.

The invention relates to a polyvinyl PTC thermo-sensitive conductive composite material, which comprises a base material and an additive, wherein the base material comprises 10-25% of LDPE, 20-40% of TiB2, 0-8% of CB and the balance of HDPE, and the additive comprises 0.1-0.3% of antioxidant1010, 1-3% of stearic acid, 1-2% vinyl trimethoxysilane, 3-5% of Sb2O3 and 8-12% of decabromodiphenyl ethane; and the adding amount of the additive is measured by the mass of organic matter components in the base material. The material has room temperature resistivity of 23.5omega . cm, long-term current capacity flow of greater than 100A and PTC intensity of 7.8, and resistance keeps stable after 100 thermal cycles.

The invention discloses a polyethylene/titanium diboride PTC (Positive Temperature Coefficient) composite material and a preparation method thereof. The polyethylene/titanium diboride PTC composite material is prepared from the raw materials consisting of main materials and processing auxiliary agents, wherein the main materials comprise the following components in percentage by mass: 10-25 percent of low density polyethylene, 40.1-50 percent of TiB2, 0-6 percent of CB and the balance of high density polyethylene; and the processing auxiliary materials comprise antioxidant 1010, stearic acid, a coupling agent of vinyl trimethoxy silane, antimony trioxide and a fire retardant of decabromodiphenylethane. The polyethylene/titanium diboride PTC composite material has low room temperature resistivity, high voltage resistance, heavy current resistance, long-term flow stability performance, high PTC strength and high PTC stability.

The invention provides a carbon nano onion lubricating phase Ti (C,N) base self-lubricating composite material and a preparing method thereof, and belongs to the technical field of composite materials. The composite material comprises, by weight percent, 10%-20% of OLC and 80%-90% of TiNx, wherein X in TiCx is larger than or equal to 0.4 and smaller than or equal to 0.9 or is equal to 1.1-1.3. According to the self-lubricating composite material, TiNx and OLC powder which are prepared through a mechanical alloying method and are in a non-stoichiometric ratio are mixed, hot pressing sintering is adopted for preparing the OLC lubricating phase Ti (C,N) base self-lubricating composite material, by utilization of the vacancy in TiNx, the sintering temperature can be reduced, and sintering is promoted. On the basis, the OLC lubricating phase Ti (C,N) base self-lubricating composite material is formed through composite sintering with OLC, the defect of lubricating failures of a traditional lubricating material in the extreme condition is overcome, and meanwhile hardness and fracture toughness of the OLC lubricating phase Ti (C,N) base self-lubricating composite material are improved.

The invention pertains to the technical field of ultrahard materials and provides a Al-Ti-N multielement compound coating layers containing Ce-Y and a preparation method thereof, aiming at lowering the number and size of 'bulky grain' in a coating layer, promoting the anti-strip performance and anti-oxidation temperature of the coating layer and increasing film forming speed simultaneously. The compound coating of the invention adopts that the Ce-Y is deposited at least one of coating layers of Ti-N and Al-Ti-N. Simultaneously, the preparation method of the invention adopts the technical proposal that Ti target containing 0.5 percent to 3 percent of the Ce-Y by weight percentage and Ti-Al target with atomic ratio of 1: 2 or 1: 3 are vaporized and ionized, and gas of N2 is conveyed to a vacuum chamber for carrying out sedimentation of the TiN coating layers and the Al-Ti-N coating layers both containing Ce-Y. The method of the invention greatly enhances the stiffness, the abrasive resistance and the high-temperature oxidation resistance of workpieces and obviously prolongs the service life and leads the Al-Ti-N multielement compound coating layers to be applicable to the processing fields, such as cutting, dry machining and the like, with high accuracy and high speed.

The invention provides oxidation-resistant SiC foam and a preparation method thereof. Organic foam is impregnated in mixed slurry, a Si-Zr alloy is introduced into the organic foam, the Si-Zr alloy homogeneously distributed in the foam reacts with C through a cracking reaction and a melting reaction, and SiC and ZrC are generated in situ. Starting from the foam body, refractory metal Zr is introduced into the body during introduction of a C precursor, ZrC-SiC compound foam is formed, a ZrO2-SiO2 composite protective film is formed on the surface of the compound foam in a high-temperature aerobic environment, and the oxidation resistance of the whole SiC foam is improved under the synergistic effect of the two oxides; the preferable proportion range of Si and Zr in Si-Zr alloy powder is determined, the synergistic effect of the two oxides is exerted sufficiently, and the oxidation resistance and the heat resistance of the SiC foam material are improved.

The embodiment of the invention discloses modified copper powder, a modification method of the modified copper powder and conductive paste. The modification method of the copper powder comprises the steps that deoxidation treatment is conducted on the copper powder; the copper powder subjected to deoxidation treatment is in contact with an antioxidant, so that a first coating film is formed on the surface of the copper powder, and the antioxidant comprises methylbenzotriazole and/or 2-mercaptobenzothiazole sodium salt. According to the modification method, a hydrophobic and compact coating layer is formed on the surface of the copper powder through the coordination effect of methylbenzotriazole and/or 2-mercaptobenzothiazole sodium salt and the copper powder, oxidation resistance and corrosion resistance protection is provided for the copper powder, the initial oxidation resistance temperature of the copper powder under the high-humidity condition is increased to 170-250 DEG C, and the oxidation resistance of the copper powder is improved. And the stability in the environment is enhanced.

The invention discloses a preparation method of an Y4Si3O12 whisker toughened mullite composite coating. The preparation method comprises the following steps of: preparing a SiC porous internal coating on the surface of a C/C composite material substrate by using an embedding method; preparing Y4Si3O12 whisker and performing surface modification on the Y4Si3O12 whisker by using composite surfactant to obtain mixed solution; performing ultrasonic electrophoresis selective assembly and deposition by using the C/C composite material prepared with the SiC porous internal coating on the surface and the mixed solution to obtain a Y4Si3O12 whisker pinning layer; and finally preparing the Y4Si3O12 whisker toughened mullite composite coating by using a hydrothermal electrophoretic deposition method. Compared with other coatings, the Y4Si3O12 whisker toughened mullite composite coating has the advantages that the anti-oxidation temperature can be effectively improved, anti-oxidation protection of 450 hours for the C/C composite material can be achieved under the high-temperature gas dynamic erosion condition of 1,500 DEG C, and the oxidation weight loss ratio is less than 0.62 percent.

The invention provides anti-oxidation HfC/SiC foam and a preparation method thereof. Organic foam is impregnated with mixed slurry, a silicon-hafnium alloy is introduced into the organic foam, cracking and melting reactions are performed, so that the silicon-hafnium alloy homogenously distributed in the foam reacts with carbon, and SiC and HfC are produced in situ. Starting from a foam body, refractory metal Hf is introduced into the body while a carbon precursor is introduced, HfC/SiC composite foam is formed, an HfO2 and SiO2 composite protective membrane is formed on the surface in a high-temperature aerobic environment, and the oxidation resistance of the foam is improved under the synergistic effect of two oxides.

The invention discloses a preparation method and a use method of a graphite antioxidant, belonging to the technical field of graphite antioxidants. The preparation method of the graphite antioxidant comprises the following step: S1, adding 30-100 parts of alkoxy silane into a reaction kettle, and then adding an aqueous solution of acetic acid, hydrochloric acid and the like, wherein the aqueous solution of acetic acid, hydrochloric acid and the like is prepared by dissolving 10-50 parts of acetic acid, hydrochloric acid and the like in 100 parts of water and then conducting uniform stirring. The boron/silicon-based antioxidant can be completely dissolved in water, a common organic solvent is not adopted, and no VOCs are discharged when the antioxidant is used; the antioxidant is faintly acid or neutral, so corrosion to a reaction container or other steel and the like is basically avoided; and after a graphite material is soaked or brushed with the antioxidant, a network structure such as Si-O-B-O-C can be formed through heat treatment, so pores or active sites of the graphite material can be better protected, and the anti-oxidation temperature of the graphite material is increased to 1000-1100 DEG C.

The invention discloses a recyclable unmanned aerial vehicle booster shell. The recyclable unmanned aerial vehicle booster shell mainly comprises a flange plate and a cylinder, a circle of groove is formed by centering the center of the upper part of a front end positioning flange plate, a groove hole in a circular truncated cone shape is formed by centering the center of the groove, the bottom end surface of the groove hole is integrally connected with the bottom end of a slope surface shell in a circular truncated cone shape in a flush mode, and the slope surface shell in a circular truncated cone shape is closely connected with the groove hole in a circular truncated cone shape; the top end of the slope surface shell in a circular truncated cone shape is integrally connected with one end of the cylinder; and a circle of step part is processed on the lower part of the front end positioning flange plate. In raw materials, a silicon nitride ceramic material is used for replacing the original high temperature-resistance metal; the silicon nitride ceramic material is prepared from components in parts by mass: 95-99 parts of silicon nitride ceramic powder, 1-2 parts of metal oxide, 5-8 parts of rare earth oxide mixtures, 0-1 part of transition metal carbide, 1 part of polyvinyl alcohol, 0-2 parts of alumina and deionized water in the amount of three times the amount of the siliconnitride powder. The recyclable unmanned aerial vehicle booster shell has the advantages of high hardness, wear resistance, high and low temperature resistance and recyclability.

The invention discloses a nickel-based alloy ultra-high temperature enamel coating and a preparation method thereof. The enamel coating comprises the following chemical components in parts by mass: 60-65 parts of glass material, 35-40 parts of aluminum oxide and titanium oxide composite ceramic material, 4-6 parts of kaolin and 65-70 parts of water, wherein the glass material comprises the following chemical components in percentage by mass: 40-42% of SiO2, 40-42% of BaO, 4-6% of CaO, 3-5% of TiO2, 3-4% of ZnO, 2-4% of CeO2, 1-2% of CoO and 2-3% of K2O. The preparation method comprises the following steps: sintering aluminum oxide and titanium oxide in a mole ratio of 1 to 1 to prepare composite ceramic, crushing and grinding, mixing the glass material, the aluminum oxide and titanium oxide composite ceramic material, the kaolin and the water, performing high-energy ball-milling so as to obtain enamel pulp, spraying the enamel pulp onto the surface of a nickel-based alloy, drying, and sintering for 5 minutes at 1190 DEG C, thereby obtaining the ultra-high temperature enamel coating. The nickel-based alloy ultra-high temperature enamel coating disclosed by the invention has the anti-oxidation capability of 100 hours at 1130 DEG C, and has the thermal shock resistance capability when being heated at 1000 DEG C and subsequently cooled in water of 20 DEG C for 15 times.