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Microstructural Morphology Of Powders

With the progress of technology, powder in metallurgy, chemical industry, electronics, magnetic materials, fine ceramics, sensors, etc. have been developed and applied, showing good prospects for application, and the powder material shows a trend towards high purity, ultrafine (nano) direction. Although the preparation of ultrafine powders in a variety of ways, according to the use and economic and technical requirements of different methods, but each method has certain limitations, there are many problems that need to be solved and improved. At present, the production of powder materials widely used method is the reduction method, electrolysis and atomisation method; in addition to the traditional production process on the basis of improvement, we have obtained a number of new production processes and methods, such as vacuum evaporation and condensation method, ultrasonic atomisation method, rotating disc atomisation method, double-roller and three-roller atomisation method, multi-stage atomisation method, plasma rotating electrode method, electric arc method. Among the methods of powder production, although many of them have been practically applied, there are still two main problems, namely, small scale and high production cost. In order to promote the development and application of powder materials, it is necessary to make comprehensive use of different methods, to complement their strengths and weaknesses, and to develop process methods with larger production volumes and lower costs.

Powder Preparation Method

At present, the industrial production of powder methods up to dozens of methods, but on the substance of the production process analysis, mainly divided into two categories of mechanical and physicochemical method, both from the solid, liquid, gaseous metal direct refinement of the metal obtained, but also from its different states of the metal compounds by reduction, pyrolysis, electrolytic transformation of the system. Refractory metal carbides, nitrides, borides, silicides can generally be produced directly by chemically or reductively - chemically. Because of the different production methods, the same powder shape, structure and particle size and other characteristics often vary greatly. The choice of metal powder production method depends on the raw material, the type of powder, the performance requirements of the powder material and the production efficiency of the powder. As the application of powder metallurgy products becomes more and more widespread, the size and shape of powder particles and performance requirements are becoming higher and higher, so the powder preparation technology is also constantly developing and innovating to adapt to the requirements of particle size and performance.

Mechanical Method

It is a processing method that crushes the metal into the required particle size powder with the help of mechanical external force, and the chemical composition of the material is basically unchanged in the preparation process of this method. At present, the commonly used methods are ball milling and grinding method, the advantages of its process is simple, large output, can prepare some conventional methods are difficult to obtain the high melting point of metals and alloys of ultrafine powder.

Ball Milling

The ball milling method is mainly divided into the rolling ball method and the vibratory ball milling method. This method makes use of the mechanism that metal particles are broken and refined by straining under different strain rates. This method is mainly applicable to the preparation of powders such as Sb, Cr, Mn, Fe-Cr alloys, etc.

Abrasive Method

Grinding method is the compressed gas through a special nozzle, sprayed to the grinding area, thus driving the materials in the grinding area to collide with each other, friction into powder; gas flow expansion with the material up into the grading area, by the turbine classifier to sort out the materials to reach the particle size, and the rest of the coarse powder to return to the grinding area to continue to grind until it reaches the required particle size to be sorted out. It is widely used in the ultrafine crushing of non-metals, chemical raw materials, pigments, abrasives, health care drugs and other industries.

Pihustamine

The atomisation method generally uses high-pressure gas, high-pressure liquid or high-speed rotating blades to break the metal or alloy that has been melted at high temperature and high pressure into tiny droplets, which are then condensed in a collector to obtain ultra-fine metal powder, and the process does not undergo chemical changes. Atomisation is one of the main methods for producing metal and alloy powders. There are many methods of atomisation, such as double-flow atomisation, centrifugal atomisation, multi-stage atomisation, ultrasonic atomisation technology, tight-coupling atomisation technology, high-pressure gas atomisation, laminar flow atomisation, ultrasonic tight-coupling atomisation and hot gas atomisation. Atomisation is usually applied to the production of metal powders such as Fe, Sn, Zn, Pb, Cu, etc. It can also be used to produce alloy powders such as bronze, brass, carbon steel, alloy steel, etc. The atomisation method can meet the special requirements of metal powders for 3D printing consumables. The left figure is a photo of the microscopic morphology of the spherical powder of high-strength titanium alloy for 3D printing prepared by our plasma rotating electrode atomisation powder making equipment:

As early as 10 years ago, we have introduced the ultra-high-pressure powder making system and process with world advanced level from the Powder Metallurgy Institute of Central South University, meanwhile, we cooperate with Beijing General Research Institute of Nonferrous Metals and other scientific and technological colleges and universities in the research, development and production of various micro-fine metal and alloy powders. The company has one set of high-pressure water atomisation and one set of gas atomisation powder making system, and one set of mechanical ball milling powder making system, which mainly produces metal, alloy and non-metallic powders of various specifications, which not only provide raw materials for the production of our sputtering targets, but also produce different varieties and specifications of powders according to the requirements of scientific research customers for scientific research purposes. At the same time, because of the diversity of powder material preparation methods and powder types, we can not independently produce all the powder products, some of the powder materials we use is the agent distribution mode, whether self-produced or agent, "high quality and efficiency" is our commitment to customers, "perfect High quality and high efficiency" is our promise to customers, "perfect" is our eternal pursuit. In addition, we have a wide range of standard powders in stock and can provide fast delivery service. Below is the catalogue introduction of some of our regular powder products, if you can't find a powder product that meets your requirements in our catalogue, it doesn't mean that there is none, you can contact us for consultation.