Yearly Archives - 2019

How to make hexagonal boron nitride powder

Boron nitride is a new ceramic material with excellent properties and great development potential. Hexagonal boron nitride (h-bn) is an isomer of boron nitride. The structure of hexagonal boron nitride is similar to that of graphite, with a hexagonal layered structure, soft texture, strong workability, and white color, commonly known as “white stone ink”. The following to introduce the commonly used method of making powder of hexagonal boron nitride. 1. Chemical vapor deposition (CVD) method. H-bn powder is generally prepared by [...]

Technology and principle of industrial extraction of vanadium pentoxide

The main raw materials for industrial extraction of vanadium pentoxide are vanadite-containing coal mines and vanadium titanomagnetite. The grade of vanadium pentoxide in vanadite-containing coal mines is generally 0.5-1.5%, and vanadium titanomagnetite is vanadium pentoxide Grade is generally between 1.0 and 5.0%. Mineral decomposition There are two kinds of decomposition methods of vanadium ore, the first is sintering method, the pulverized ore powder mixed with soda ash or sodium salt and sintered at high temperature, so that the low-priced vanadium oxidized and [...]

Common synthetic method for preparing aluminum nitride powder

Currently, there are many methods to prepare aluminum nitride powder, such as direct nitriding of aluminum powder, carbonothermic reduction of alumina, sol, self-tensioning, plasma synthesis, decomposition of polymer containing ALN bond, chemical vapor deposition, water-induced solid phase reaction, sol-gel method, etc. The following small series for you to introduce the aluminum nitride powder commonly used synthesis. 1) direct nitriding of aluminum powder ALN+N2→2ALN put aluminum powder into the reaction furnace filled with nitrogen and ammonia reaction to heat to 600℃ to [...]

What is the difference between hexagonal boron nitride and cubic boron nitride

There are four types of boron nitride, hexagonal boron nitride, rhomboid boron nitride, cubic boron nitride and wurtzite boron nitride. It’s easy to confuse hexagonal boron nitride with cubic boron nitride. What’s the difference between hexagonal boron nitride and cubic boron nitride? The difference between hexagonal boron nitride and cubic boron nitride lies in their different physical structures and USES. Boron nitride is a kind of white crystal, stable chemical property, high temperature resistance, melting point up to 3000 degrees Celsius, [...]

Research on flame retardant nano magnesium hydroxide process

China’s plastic flame retardant material is mainly based on decabromodiphenyl ether, but decabromodiphenyl ether in combustion will produce toxic carcinogenic polybrominated dibenzofuran and other substances, and make it some countries to resist the use of. Therefore, flame-retardant materials also develop towards the direction of high efficiency, low toxicity and low smoke. It is necessary to develop nontoxic flame retardant with excellent performance. Inorganic materials used as flame retardants include Mg(OH)2, AL(OH)3, Sb2O3, etc. These inorganic flame retardants not only [...]

The difference between industrial grade lithium carbonate and battery grade lithium carbonate

Compared with industrial grade, battery grade lithium carbonate has high purity, few impurities and good performance. Lithium carbonate is an inorganic compound. It is colorless monoclinic crystal or white powder. Its chemical formula is Li2CO3. Soluble in dilute acid, slightly soluble in water, greater solubility in cold water than in hot water. Insoluble in alcohol and acetone. Density 2.11g/cm3, melting point 723℃. Can be used to make ceramic, medicine, catalyst, commonly used lithium ion battery materials. Compounds, lithium metals and isotopes [...]

Properties of nano-aluminum nitride filled ptfe composites

Nano aluminum nitride powder has high specific surface area, high hardness, high thermal conductivity, high insulation and other characteristics, belongs to diamond-like nitride, can be stable to 2200℃, high strength at room temperature, good compatibility with the matrix interface, can improve the thermal conductivity and dielectric properties, mechanical properties and wear resistance of the composite. PTFE, commonly known as “plastic king”, has a linear molecular chain structure and is a non-polar polymer, with good chemical corrosion resistance, high and low [...]

Characteristics and application of barium titanate ceramics

Barium titanate ceramics are ceramic materials with barium titanate (BaTiO3) or its solid solution as the main crystal phase. The main raw materials are barium carbonate and titanium dioxide. Generally, barium titanate is synthesized at 1200℃ first, and then modified oxide is added. After fine grinding, it is sintered at 1400℃ or so. Used as dielectric material of capacitor and make many kinds of piezoelectric devices Barium titanate ceramics are ceramics with barium titanate or its solid solution as the [...]

Shanghai silicate institute has made progress in the research of BiVO4 based photoanode materials

Solar photoelectric chemistry (PEC) cracking water is an effective method to convert solar energy into hydrogen energy. Among many semiconductor photoanodes, BiVO4 is an excellent photoanode material due to its suitable conduction band, valence band position and forbidden band width. BiVO4 has a light absorption edge of 515nm and a theoretical maximum photocurrent density (Jmax) of 7.5ma cm-2 under AM1.5 sunlight. However, the actual photodecomposition hydroelectricity current density (JH2O) is much lower than its theoretical value, mainly because BiVO4 [...]

Research on nano aluminum nitride in thermal conductive plastics

1. Heat-conducting silica gel and epoxy resin: Ultra-high thermal conductivity nano-aln composite silica gel has good thermal conductivity, good electrical insulation, wide electrical insulation service temperature (working temperature -60℃- 200℃), lower consistency and good construction performance. Products have reached or exceeded imported products, because can replace similar imported products and widely used in electronic devices heat transfer medium, improve work efficiency. Such as CPU and radiator gap, high-power audion, thyristor element, diode, and the substrate contact with the thin seam [...]