43results about How to "Lower densification temperature" patented technology

The invention belongs to the field of structural ceramics, and particularly discloses a method for obtaining a compact titanium diboride material by using in-situ reaction between sintering aids. Mixed powder of Ti, Al and BN capable of reacting at a low temperature is utilized as a sintering aid; TiB2 ceramic of which the relative density is more than 98% is obtained at a low temperature (1250-1550 DEG C); meanwhile, the material also has the characteristics of high strength, high hardness, high elasticity modulus and the like. In addition, the final products of in-situ reaction between the sintering aids such as Ti, Al, BN and the like and amorphous oxide reaction of the TiB2 surface are TiB2, TiN, Ti2A1N, Al5O6N and the like. Except for the TiB2, the TiN, the Ti2A1N, the Al5O6N and the like also have high melting points and chemical stability, so that the TiB2 ceramic becomes a latent high-temperature structure material.

The invention discloses a synthesis method for a La<x>Sr<1-x>Ti<1-y>Mn<y>O<3> (x=0.1-0.6, and y=0.1-0.6) material for a solid oxide fuel cell. N,N-dimethylformamide (DMF) is adopted as a solvent, tetrabutyl titanate is adopted as a titanium source and manganese acetate is taken as a manganese source, so that the process is simple, the prepared powder is uniform in particle size distribution and the particle sizes are smaller than 50nm. The powder prepared through the method is suitable for laboratory synthesis and industrial production of a positive electrode material for the solid oxide fuelcell and a connector material.

A pressureless sintering preparation method of Ti2SC ceramic is characterized by comprising the following steps: (1) evenly mixing Ti2SC ceramic powder with polyvinyl alcohol PVA, and then filling into a die for preforming; (2) performing cold isostatic pressing treatment on the preformed Ti2SC ceramic; (3) putting the cold isostatic pressing treated Ti2SC ceramic into a microwave sintering furnace filled with inert gas protective atmosphere for sintering for 20-60 minutes at 800-1100 DEG C to obtain the Ti2SC bulk ceramic; the preparation method not only improves the density of the ceramic material, realizes the controllable density of the Ti2SC ceramic material, can prepare Ti2SC ceramic materials with complex shapes, and has the advantages of low sintering temperature, short time, saving energy and the like.

The invention provides a rapid preparation method of ultra-hard light diamond-B4C-SiC ternary composite ceramics, comprising the following steps: selection of raw material powder; preparation of ternary mixed powder; rapid sintering of powder in situ reaction; Subsequent processing of the sample, the prepared superhard lightweight diamond‑B 4 B in C‑SiC ternary composite ceramics 4 The C‑SiC ceramic phase accounts for 70‑82%, and the diamond phase accounts for 18‑30%. In the present invention, diamond, boron powder and silicon powder are used as raw materials, and the ternary mixed powder is equipped with in-situ reaction and rapid sintering under the conditions of high heating rate and short holding time, which reduces the sintering temperature of ceramic densification, and effectively Inhibits the graphitization of diamond; at the same time, the liquid phase formed by silicon during sintering accelerates the reaction and promotes the densification of ternary composite ceramics; the preparation cost is low, the production cycle is short, and the diamond particles in the product are evenly dispersed in B 4 Between C and SiC ceramics, there is no graphite residue and the structure is dense, and it has the characteristics of ultra-high hardness, high strength, high toughness and light weight.

A method for manufacturing a rare-earth permanent magnetic material comprises manufacturing a NdFeB magnetic from NdFeB alloy powder by two consecutive compression molding processes. An oriented magnetic field is applied in the first molding process to obtain an anisotropic NdFeB green body, and heating and pressing are applied in the second molding process to obtain a dense NdFeB magnetic having a size close to that of a final product. The performance of the magnetic is enhanced through a special thermal treatment process, which involves a low densification temperature that suppresses the enlargement of crystals, and thus provides crystals that are smaller compared to those of a sintered magnet and that have high magnetic performance. By adopting the molding processes, the size of a magnet is close to that of a final product, and the material utilization rate is much greater than that of a conventional sintered NdFeB magnet. Further, the method does not require a dedicated fast-quench magnetic powder or thermal deformation, providing a simple process, high production efficiency, production costs far lower than those of a thermal pressed / thermal deformed magnetic, and high magnetic performance achieving a maximum magnetic energy product above 200 kJm-3, much higher than that of a bonded NdFeB magnet.

[Problems] Provided is a transparent conductive film used for a liquid-crystal display device, an electroluminescent display device, or the like, and particularly suitable for use in a solar cell. Also provided is a solar cell using the transparent conductive film and a sputtering target suitable for forming the transparent conductive film. [Solving Means] The provided transparent conductive film is composed of an Al-Mg-Ga-Zn-based oxide of which the content ratios of metal component elements are 0.7-7% Al, 9.2-25% Mg, 0.015-0.085% Ga, and the remainder is Zn, by atomic ratio, and is excellent in moisture resistance.