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Nano Powder Machine Preparation Method
- Sep 19, 2017 -

Nano powder is also known as superfine powder or superfine powder, generally refers to under 100 nm powder or particles, is a kind of between atoms, molecules and macroscopic objects in the middle of state of solid materials. Applicable: high density magnetic recording materials; Absorbing wave stealth material; Magnetic fluid material; Radiation protection material; Polishing materials for single crystal silicon and precision optics; Microchip thermal conductivity substrate and wiring materials; Microelectronic packaging materials; Photoelectronic materials; Advanced battery electrode material; Solar cell material; Highly efficient catalyst; High efficiency accelerant; Sensitive components; High ductile ceramic material (porcelain for breaking, ceramic engine, etc.); Human repair materials; Anticancer agents.

1. Highly efficient catalyst: the high activity of nanometer powder and its larger surface area make it more suitable for use as catalyst. The experimental results show that nano cobalt powder, powder, zinc powder and so on have a strong catalytic effect. Use of the nano powder catalyst in the chemical synthesis of some organic compounds, the catalytic efficiency is several times higher than traditional catalyst, can be used for organic hydrogenation, automobile tail gas treatment, etc. (nano cobalt powder, nano nickel powder, nano-zinc powder)

2. High efficiency fuel: nanometer powders have extremely strong energy storage properties, which can greatly improve the combustion rate as additives into fuel. Adding some nano powder to the solid fuel propellant of the rocket can greatly improve the combustion heat and combustion efficiency of the fuel and improve the combustion stability. Studies have shown that adding 0.5% of nano-aluminum powder or nickel powder to rocket solid fuels can increase combustion efficiency by 10% to 25% and increase combustion speed by tens of times. (nano aluminum powder, nano nickel powder)

Preparation of nano metal powder:

1. Traditional preparation methods: gas phase method, liquid phase method and solid phase method.

2. New preparation methods: plasma gasification method and metal spray combustion method.

Examples of work nano powder form requirements

The particle size and morphology requirements of micronano powders vary by application. Iron oxide alpha, beta, gamma three crystals. Reaction of water-gas transformation, isobutane dehydrogenation reaction catalyst is needed for the alpha crystal form of iron oxide catalyst, magnetic recording medium and superfine ferromagnetic oxide powder is the need to have a gamma crystal shape, particle size is smaller than 0.3 points, the shape is an aspect ratio greater than 8 stitches. In addition, the best form of the pigment alpha-fe2o3 is a rod, compact disc and table. A12O3 alpha, gamma, theta, eta and eight other crystal forms, catalyst and carrier alumina should be eta -A12O3 or gamma-a12o3 and alpha-a12o3 are important ceramic materials. There are three main hydrate alumina hydrate and two kinds of single hydrate, flame retardant materials, the requirements of three hydrate, fine particle size, a reasonable level, good transparency, particle shape of chips, fine prism

The special requirements of particle size and morphology in the preparation of powder materials. The application of different materials in the field of particle size and particle size requires a new topic for the development of the preparation technology of powder materials, namely the preparation and treatment of particle morphology and particle size control. Therefore, in the preparation of micro-nano powder, it is very important to control the morphology of morphology according to its application.

In the preparation and processing of functional powder materials, particle morphology and particle size control often depend on the analysis of particle formation mechanism. Particle formation mechanism is the basis of powder form and particle size control. The mechanism of particle formation is shown in figure 3.1.

In the process of wet chemical precipitation, the formation of powder particles can form nucleus, growth and accumulation.