32results about How to "Improve sintering density" patented technology

The invention provides a zirconia-based ceramic back plate, a preparation method and application thereof. According to the invention, zirconia, zirconium oxychloride and lanthanum hexaboride are used as initial raw materials, a green body is obtained through uniform mixing, hydrolysis, drying and ultrahigh-pressure isostatic cool pressing pretreatment in the presence of a binder, and is free of organic volatilization, low in porosity and free of density gradient, and the blank is subjected to presintering, slicing and secondary sintering treatment to obtain a zirconia ceramic back plate, wherein the zirconia ceramic back plate obtained after the blank is sintered is good in sintering density, high in strength and high in wear resistance and has high toughness, strength and hardness and excellent wear resistance and heat stability.

The invention provides high-compactness boiling-resistant solar aluminum paste. The high-compactness boiling-resistant solar aluminum paste is characterized by comprising, by weight, 75-78% of spherical aluminum powder, 20-25% of organic binding agents, 1-2% of glass powder, and 0.1-0.2% of boron carbide micro powder, wherein the spherical aluminum powder comprises, by weight, 10-20% of spherical aluminum powder of 7-8 micrometers, 10-20% of spherical aluminum powder of 6-7 micrometers, 40-60% of spherical aluminum powder of 5-6 micrometers and 10-20% of spherical aluminum powder of 1-2 micrometers. The organic binding agents comprise, by weight, 94.5% of mixed solvent, 2% of low grade ethyl cellulose, 4% of high grade of ethyl cellulose and 0.5% of hydrogenated castor oil. Through adjustment and optimization of a formula, boiling-resistant performance of an aluminum back surface field is significantly improved.

The invention discloses a preparation method of a novel phosphate composite ceramic solidified body material, which comprises the following steps: mixing raw materials, presintering to obtain a precursor, adding a sintering aid into the precursor, and carrying out mechanical activation, molding and sintering to obtain the novel phosphate composite ceramic solidified body material; wherein a phosphorus source in the raw materials is ammonium dihydrogen phosphate or phosphorus pentoxide; the raw materials of elements A, B, Ln and An in the raw materials are one selected from nitrate, metal alkoxide or oxide; A is a +1 or +2 valent element, B is a +4 valent element, Ln is a +3 or +4 valent lanthanide, and An is a +3 or +4 valent actinide. The NZP type ceramic and the monazite ceramic in the novel phosphate composite ceramic solidified body prepared by the invention are solidified body materials with excellent chemical stability, so that the phosphate composite ceramic solidified body is large in waste packaging capacity and good in stability.

The invention relates to a low-temperature sintering method of ultra-high-temperature ceramic, belonging to the technical field of preparation of compact ceramics. The ultra-high-temperature ceramic is a material capable of maintaining chemical stability in a high temperature environment (with a temperature higher than 2000 DEG C) and mainly contains certain high-melting-point transition metal compounds such as boride and carbide, and low-temperature sintering is carried out at 1650-1750 DEG C. The ultra-high-temperature ceramic prepared by virtue of the method is high in density.

The invention relates to a preparation method for carbon particle reinforced metal base composite materials, and belongs to the technical field of metal material preparation. Carbon parcel and phenolic resin uniform-embedded metal powder is obtained through high energy of degummed short carbon fibers and phenolic resin powder, is ultrasonically processed and dried to obtain surface carbon removedand carbon and phenolic resin powder embedded metal powder, and is mixed with the phenolic resin powder and other components for pressing and sintering to obtain the carbon particle reinforced metal base composite materials. The preparation method successfully solves the problem of loose interface sintering of the carbon particle embedded metal powder in the sintering process; under the precondition of realizing compact sintering of the metal powder, the mechanical performance and the wear resistance of the designed and prepared metal composite materials are greatly improved; the preparation process is simple; and the cost is low.

The invention provides an aluminum-silicon alloy graphite composite heat conduction material, and a preparation method and an application thereof, the aluminum-silicon alloy graphite composite heat conduction material is prepared by mixing aluminum-silicon alloy powder with graphite packing and then performing hot pressed sintering for the obtained mixture under a vacuum condition; and in the material, the graphite packing is evenly dispersed in an aluminum-silicon alloy matrix. The material provided by the invention has relatively higher heat conductivity, relatively higher compactness, relatively higher effective strength and a relatively lower coefficient of thermal expansion, and can be used for manufacturing high-power electronic devices so as to solve a difficult problem of heat conduction of the high-power electronic devices.

The invention relates to a high-stability low-temperature-sintering laminated chip varistor material and belongs to the technical field of electronic materials. The high-stability low-temperature-sintering laminated chip varistor material has the advantages that by adding Ta2O5 and BBSZ glass into a ZnO-Bi2O3-based low-temperature-sintering varistor material and using a liquid phase sintering mechanism to accelerate a mass transfer process, the sintering compactness of the material is further increased, and the sintering temperature of the material is lowered; a chip varistor produced by the material through a laminated chip capacitor production process has a high-stability voltage-sensitive feature and is low in sintering temperature (850-925 DEG C), high in nonlinear coefficient (not smaller than 86.26), small in leakage currents and promising in application prospect.

The invention provides a doped modified ceramic capacitor material for equalizing the voltages of a zinc oxide arrester, in particular to a high-pressure ceramic capacitor material prepared from 80-84 percent of SrTiO3, 8-10 percent of BiO8, 0.5-2 percent of TiO2, 0.1-1 percent of MnO2, 4-8 percent of YO4 and 3-5 percent of MgTiO3. By adopting the formula, solid volume limit in SrTiO3 crystal lattices can be increased, a strong peak shifting and broadening action is generated, and the capacitor temperature characteristics are improved. Meanwhile, the electric constant is increased to 2500, the dielectric loss is smaller than 0.0001, the change rate of the high-temperature stability capacity along with temperature is smaller than 10 percent, and the lightning-protection and voltage-equalizing actions are excellent.

The invention discloses a preparing method for a magnesium synthetic material. The preparing method comprises the following steps that light roasting magnesium calcium powder is subjected to sufficient fine grinding, light roasting calcium magnesium fine powder is obtained, and in addition, iron oxide red is subjected to sufficient fine grinding; the obtained fine powder and finely ground iron oxide red are subjected to co-grinding, and activated nano calcium carbonate is evenly added in the co-grinding process; water is added in the co-grinding fine powder, the mixture is placed in a rolling machine to be subjected to stirring and wheel rolling, stirring is uniform, and the press heating temperature is larger than or equal to 40 DEG C; wet powder is added in a ball pressing machine to be compacted, and ball blanks are manufactured in the ball pressing process; the obtained ball blanks are naturally dried; and the obtained dry blanks are placed in a kiln to be fired, the firing temperature ranges from 1,600 DEG C to 1,700 DEG C, heat preservation is conducted for 2-6 h, and the magnesium synthetic material is obtained. According to the preparing method, the magnesium synthetic material can be manufactured at the relatively low firing temperature and the short firing time, coal consumption is effectively reduced, the production cost is controlled, sufficient sintering of the magnesium synthetic material is guaranteed as well, and the firing compactness of the magnesium synthetic material is improved.

The invention discloses an LTCC ceramic material as well as a preparation method and application thereof. The LTCC ceramic material disclosed by the invention comprises the following components in percentage by mass: 30 to 40 percent of KBS glass powder and 60 to 70 percent of spherical SiO2. By adding the spherical SiO2, the dielectric constant of the LTCC is effectively reduced, so that the dielectric constant of the material is as low as 3.7, and the dielectric loss is as low as 0.2%; the sphericity degree of the spherical SiO2 is greater than or equal to 98%, and the spherical SiO2 is graded by SiO2 with three particle sizes, so that the sintering compactness of the material is improved, and the porosity of a sintered ceramic body is as low as 0.09%. The LTCC ceramic material disclosed by the invention has the advantages of ultralow dielectric constant, low loss and good compactness, and is suitable for the fields of high-frequency communication and radio frequency.