Articles

Application and prospect of molybdenum carbide in electrocatalytic hydrogen production

With the depletion of petroleum, coal and other traditional fossil energy and the worsening of environmental problems, the traditional energy structure system based on fossil energy is facing unprecedented crisis and challenge. Hydrogen, with its high energy density, excellent combustion performance, clean and pollution-free, is the best alternative to green energy from traditional fossil energy. However, the utilization of hydrogen energy depends on the development of hydrogen production technology to a large extent. At present, industrial hydrogen production technology [...]

The invention relates to a preparation method of nano-scale neodymium oxide lubricating oil additive

Lubricating oil is a common lubricating material, which can reduce equipment wear and tear, prolong equipment service life and reduce maintenance cost. Lubricating oil is composed of different types of base oils and various additives with different properties, among which additives can make up for the deficiency in the performance of base oils, which is an important factor to improve the properties and quality of oil products. With the increasingly harsh working conditions of equipment and the strict requirements [...]

Less than 10,000 tons a year worldwide,High performance aluminum nitride powder is difficult to produce,why?

Aluminum nitride (AlN) ceramics have good thermal, electrical, mechanical and chemical stability, and are now more ideal substrate materials and electronic packaging materials. The excellent performance of AlN ceramics is directly related to the performance of raw material powder, and the high performance AlN powder is the key to prepare high thermal conductivity AlN ceramics. In foreign countries, the manufacturing process of AlN powder has been quite mature and the commercialization degree is also very high. Previously, according to the [...]

What is the preparation method of Ammonium paratungstate

The molecular formula of APT crystallization is 5(NH4)2O·12WO3·nH2O(n=5, 7, 11), and its solubility in water is very small, which increases slightly with the rise of temperature. Ammonium secondary tungstate crystallization is the main intermediate product for the preparation of blue tungsten oxide, ammonium tungsten bronze and tungsten powder, and its morphological structure greatly affects the morphology and properties of tungsten products. The particle size and loose packing density of tungsten products are dependent on the raw material ammonium secondary [...]

The invention relates to a preparation method and a process of ammonium fluotitanate

Ammonium fluotitanate, also known as ammonium hexafluorotitanate, is commonly used in ceramics and glass as an anti-corrosive cleaner and in the manufacture of artificial gems; In addition, it can also be used to synthesize the titanium oxide precursor with special morphology. Ammonium fluoride titanate powder is stable at room temperature and insoluble in water. In the existing preparation methods of ammonium fluoride, the raw materials used are usually more complex, the cost is higher, and the preparation method is [...]

Vanadium carbide and its preparation method and process

Vanadium carbide, black crystal, density 5.25-5.4 black crystal, melting point 2750℃, slightly harder than quartz. Mainly used in the manufacture of vanadium steel, can also be used as carbide carbide additive. Can be used in structural steel, tool steel, pipe steel, rebar, ordinary engineering steel and cast iron. The research shows that adding vanadium carbide to steel can improve the comprehensive mechanical properties of steel, such as wear resistance, corrosion resistance, toughness, strength, ductility and hardness as well as [...]

Sodium titanate holds graphene together to create a high energy, high power micro capacitor

With sea urchin sodium titanate as the negative pole and porous activated graphene as the positive pole, what kind of “spark” will be generated when they combine? According to the dalian Institute of Chemical Physics, Chinese Academy of Sciences, wu Zhongshuai’s team and Bao Xinhe’s team worked together to combine “sea urchins” with graphene to develop flexible sodium ion micro-supercapacitors with high energy density and high heat resistance. Micro miniature sensors, micro robot, the power supply system is inseparable from [...]

To verify the microstructure and properties of laser cladding tungsten carbide nanometer layer

In tungsten carbide, carbon atoms embedded in the gap of the tungsten metal lattice do not destroy the original metal lattice and form interstitial solid solution, so it is also called interstitial compound. Tungsten carbide can be prepared by heating a mixture of tungsten and carbon at high temperatures, and the presence of hydrogen or warp accelerates the reaction. If the oxygen-containing compound of tungsten is used for preparation, the product must eventually be vacuumed at 1500℃ to remove [...]

Preparation of nanometer tungsten carbide composite powder

Tungsten carbide is a black gray crystalline powder. Relative density 15.6(18/4℃), melting point 2600℃, boiling point 6000℃, Mohs hardness 9. Tungsten carbide insoluble in water, hydrochloric acid or sulfuric acid, soluble in nitric acid and hydrofluoric acid mixture. Tungsten carbide reacts strongly with fluorine at room temperature and is oxidized to tungsten oxide when heated in air. At 1550 ~ 1650℃, the metal tungsten powder can be directly combined with carbon black, or at 1150℃, the tungsten powder can [...]

The high precision isotope ratio analysis of ultramicro strontium samples can be realized by using silicotungstic acid as the emitter

Strontium isotope ratio (87Sr/86Sr) has been widely used in earth science, astrochemistry, environmental chemistry, food origin tracing, archaeology and other fields. Since the 1960s, the Thermoelectric ionization mass spectrometer (TIMS) has been regarded as the benchmark technique for ratio analysis of 87Sr/86Sr with excellent accuracy and high sensitivity. Excellent sensitivity is the prerequisite for the analysis of high precision 87Sr/86Sr ratio in ultramicro samples. The key to improve the sensitivity lies in the selection of suitable emitters to improve [...]