Monthly Archives - 三月 2021

Analysis method of vanadium pentoxide

Wage sample 0.1g (weigh to 0.0001g) in 300ml triangular conical flask, add 1:1 sulfuric acid 5ml, add a little steaming water, heat and dissolve, take off, add 3:1: 1 sulfur phosphate 15 ml, drops of 10% ammonium ferrous sulfate solution to a green, cool to room temperature in cold water with 3% potassium permanganate oxidation to solution is slightly red don’t disappear, then add about 1 gram of solid urea with 1% sodium nitrite is original to solution is [...]

Preparation of hexagonal flake nano magnesium hydroxide materials

Magnesium hydroxide is a kind of green, low-cost and environment-friendly inorganic additive flame retardant. It has the advantages of good thermal stability and non-toxicity. It can be widely added to polymer materials such as plastics, rubber and coatings to improve their flame retardant properties. However, the hexagonal flake-like nanometer magnesium hydroxide material with small particle size and low surface polarity has good dispersibility and nanometer activity. In the case of almost no impact on the use of strength, can [...]

Application and prospect of boron nitride nanomaterials

The purpose of preparation and characterization of boron nitride nanomaterials is to improve the properties of traditional boron nitride materials, give full play to their various effects at the nanoscale level, achieve expected excellent properties and expand new application fields. 1, boron nitride coating has obvious chemical inertia at high temperature, so that boron nitride coating can be used to protect aluminum, magnesium, zinc alloy and other materials from high temperature oxidation. When coated with refractory or ceramic ware, [...]

Hafnium carbide ceramic material additive

At present, the method of synthesis of hafnium carbide at home and abroad is not much reported, the original method, generally need to be above 1900℃ to react, high energy consumption, high requirements for equipment, and grow out of the particle size, need to use other methods to reduce the reaction temperature. (2) Liquid phase precursor conversion method. Wang Yanbin et al. used HfoCl2, HCl, HNO3, n-propanol, isopropanol, ethanol, acetyl and other HFC powders with sizes ranging from tens [...]