Powder metallurgy materials - Huaqiang Electronic Network

A porous, semi-densified or fully dense material (including articles) made by a powder metallurgy process. Powder metallurgy materials have unique chemical composition and physical and mechanical properties that cannot be obtained by traditional casting and casting processes. For example, the porosity of the material is controllable, the material structure is uniform, and there is no macrosegregation. (The alloy is solidified and the different parts of the section are not caused by the liquid alloy macroscopically. The chemical composition is uneven due to the flow), and can be molded at one time.

Specific surface area of ​​powder metallurgy materials

Research is very important,

Powder metallurgy

Material specific surface area detection

Data only uses BET

Method detection

The result is true and reliable.

At present, there are many instruments in China that can only be tested by direct comparison method, and now they have been eliminated in China.

At present, the specific surface area test at home and abroad adopts multi-point BET

Law, the specific surface area measurement standards developed at home and abroad are

By BET

Based on the test method, please refer to China's national standard (GB/T 19587-2004)

)-

Gas adsorption BET

The principle of determining the specific surface area of ​​a solid material.

The specific surface area detection is actually a relatively time-consuming task. Due to the different adsorption capacity of the sample, some samples may take a whole day to test. If the test process is not fully automated, the tester can not leave at all times. High concentration, observing the instrument panel, operating the knob, a little inattention will lead to the failure of the test process, which will waste a lot of treasures for the testers.

Your time.

Beijing Jine Spectrum Technology Co., Ltd.

F-Sorb 2400

The specific surface area analyzer is truly capable of achieving BET

Instrument for detecting function (both direct contrast method)

,more important

Beijing Jine Spectrum Technology Co., Ltd.

F-Sorb 2400

The specific surface area analyzer is the only fully automated and intelligent specific surface area testing equipment in China. The test results are highly consistent with international standards and stability, and reduce human error and improve the accuracy of test results.

[English]:powder metallurgy material

[Explanation]:

A porous, semi-densified or fully dense material (including articles) made by a powder metallurgy process. Powder metallurgy materials have unique chemical composition and physical and mechanical properties that cannot be obtained by traditional casting and casting processes. For example, the porosity of the material is controllable, the material structure is uniform, and there is no macrosegregation. (The alloy is solidified and the different parts of the section are not caused by the liquid alloy macroscopically. The chemical composition is uneven due to the flow), and can be molded at one time. Usually divided into uses

7 categories.

1 powder metallurgy antifriction material. Also known as sintering antifriction materials. It is prepared by immersing lubricating oil in the pores of the material or adding a friction reducing agent or a solid lubricant to the material composition. The friction coefficient between the surfaces of the material is small, and the service life is long and the reliability is high under the limited lubricating oil condition; under the dry friction condition, the lubricant contained in the surface or the surface layer has self-lubricating effect. Widely used in the manufacture of bearings, support bushings or face seals.

2 powder metallurgy porous material. Also known as porous sintered material. It is formed by molding or sintering a spherical or irregularly shaped metal or alloy powder. The internal channels of the material are criss-crossed and interpenetrated, generally

30% to 60% of volume porosity, pore size of 1 to 100 microns. Through performance and thermal conductivity, good electrical conductivity, high temperature resistance, low temperature, thermal shock resistance, and resistance to media corrosion. Used in the manufacture of filters, porous electrodes, fire extinguishing devices, antifreeze devices, etc.

3 powder metallurgy structural materials. Also known as sintered structural materials. Can withstand loads such as stretching, compression, and twisting, and can work under friction and wear conditions. Due to the presence of residual pores inside the material, the ductility and impact values ​​are lower than those of the same forgings with the same chemical composition, which limits its application range.

4 powder metallurgy friction material. Also known as sintered friction material. From base metal (copper, iron or other alloys), lubricating components (lead, graphite, molybdenum disulfide, etc.), friction components (silicon dioxide, asbestos, etc.)

3 parts. The friction coefficient is high, the kinetic energy can be quickly absorbed, the braking speed, the transmission speed is fast, the wear is small, the strength is high, the high temperature resistance is good, the thermal conductivity is good, the seizure resistance is good, the corrosion resistance is good, and the oil and moisture are less affected. Mainly used in the manufacture of clutches and brakes.

5 powder metallurgy mold materials. Including cemented carbide, powder metallurgy high speed steel. The latter has a uniform structure, small crystal grains, no segregation, better toughness and wear resistance than cast high speed steel, small heat treatment deformation and long service life. Can be used to make blanks for cutting tools, molds and parts.

6 powder metallurgy electromagnetic materials. Includes electrical and magnetic materials. Among the electrical materials, powder metallurgy materials of precious metals such as gold, silver, platinum, etc., which are used as electric energy head materials, and powder metallurgical materials made of tungsten, nickel, iron, tungsten carbide, graphite, etc., using silver or copper as a base; The electrode has powder metallurgy materials such as tungsten copper, tungsten nickel copper; metal used as a brush

- Graphite powder metallurgy material; used as electrothermal alloy and thermocouple with powder metallurgy materials such as molybdenum, niobium and tungsten. Magnetic materials are classified into soft magnetic materials and hard magnetic materials. The soft magnetic material includes a magnetic powder, a magnetic powder core, a soft ferrite, a rectangular ferrite, a piezoelectric ferrite, a microwave ferrite, a ferrite, and a powdered silicon steel; the hard magnetic material has a hard ferrite, a rare earth cobalt Hard magnetic, magnetic recording materials, micro-hard magnetic, magnetic plastics, etc. Used to make a variety of magnetic devices that convert, transfer, store energy and information.

7 powder metallurgy high temperature materials. Including powder metallurgy superalloys, refractory metals and alloys, cermets, dispersion strengthening and fiber reinforced materials. Used to manufacture turbine discs, nozzles, blades and other high temperature parts for use at high temperatures.

Development trend of powder metallurgy materials

The development of powder metallurgy materials is in the ascendant. The automobile industry is the largest market for powder metallurgy. As the quality of powders continues to increase, the cost of powder manufacturing continues to decrease; the equipment cost of forming machines is no longer high, and the application of powder metallurgy materials will become wider and wider. .