SINTS MIM new materials

1) Powder metallurgy high speed steel

The ingot of high speed steel made by traditional melting casting method will inevitably produce uneven alloy composition and coarse Letenite segregation, which has become a chronic disease of its structure and has long troubled metallurgists. It is the powder metallurgy process that successfully solves the problem of the traditional metallurgical process, eliminates the macroscopic segregation, makes the grain fine, significantly improves the performance and isotropy, and provides a feasible way to produce ultra-high alloy content high-speed steel.

 

The excellent microstructure and properties of powder metallurgy high speed steel benefit from the combination of rapid solidification powder production, hot isostatic pressing and hot extrusion densification process. Powder metallurgy method can produce high alloy, rich carbide high speed steel which is difficult to produce and cannot be produced by conventional metallurgy method. The total amount of alloy in powder metallurgy high speed steel is as high as 30% and still has uniform structure; The grindability is still good when the vanadium content is up to 9.8%. This composition design criterion can also be applied to other high alloy tool steels. In addition, the powder metallurgy process allows the addition of sulfur to improve the grindability of high speed steel without reducing its mechanical properties.

 

2) Rare earth permanent magnet

Rare earth permanent magnet alloy is a class of high-performance permanent magnet materials formed by rare earth metals (Sm,Nd,Pr, etc., represented by R) and excessive metals (Co, Fe, etc., represented by TM). Generally, SmCo5 (Type 1-5), Sm2TM17 (type 2-17) and Nd-Fe-B appeared in 1977 and 1983 respectively are called the first, second and third generation rare earth permanent magnet materials. The maximum magnetic energy product (BH) max is:

         

                                        SmCo5           160kJ/m3

                                        Sm2TM17       200~240kJ/m3

                                        Nd-Fe-B          240~400kJ/m3

 

3) Powder metallurgy superalloy

Powder metallurgy superalloy (or powder superalloy) is the best material for manufacturing new aero engine parts with high thrust ratio. Compared with traditional casting and forging alloys, powder metallurgy superalloy has fine grain, uniform structure, no macro segregation, high alloying degree, high yield strength, high fatigue performance and good machining performance. Powder metallurgy method can realize near final forming process, thus saving materials and low cost. SINTS powder metallurgy superalloy is mainly used in the manufacture of turbine disc, compressor disc, drum shaft, sealing disc, sealing ring, wind guide wheel and turbine high pressure baffle and other high temperature bearing rotation parts. Research in the field of powder metallurgy superalloy has been carried out in the United States, Russia, Britain, France, Germany, Canada, China, Japan, Italy, Sweden and India, among which the United States and Russia are in a leading position.

 

4) Powder metallurgy high strength aluminum alloy

As early as the mid-1940s, the American Aluminum Industry Company (Alcoa) began to conduct research on sintered aluminum. In 1952, the company developed the first generation of powder metallurgy aluminum alloy materials (SAP). This is an Al-Al2O3 dispersion-strengthened alloy with excellent high temperature strength and thermal stability.

 

The rapid solidification technology, mechanical alloying technology and composite technology that appeared in the 1970s contributed to the advent of powder metallurgy high-strength aluminum alloys, and its rapid development in the 1980s. Rapid solidification and mechanical alloying make aluminum alloy produce a qualitative leap, its structure is obviously refined, basically eliminate segregation, alloy composition design range is greatly expanded, tensile strength, elastic modulus, corrosion resistance and fatigue properties are comprehensively improved, especially the fracture toughness and strength are well balanced. Rapid solidification process can obtain metastable phase and precipitate fine dispersion, which is impossible to achieve in ingot metallurgy technology.

 

5) Powder metallurgy diamond - metal tool material

Powder metallurgy technology entered the diamond tool manufacturing industry in the 1920s, gradually replacing the mechanical fixation method and bronze pouring insert method and occupy a dominant position. The manufacture of diamond-metal tools by powder metallurgy is simple, low cost, high efficiency and good product quality. In 1930, diamond grinding wheels and saw blades manufactured by powder metallurgy process (mixing - pressing - sintering) were born, and were quickly widely used in hard material processing. In the late 1930s, the diamond geological drill made by powder metallurgy impregnation method was put into use. In the 1940s, large complex shape diamond oil bits appeared, showing their power in geological and oil hard formation drilling.

 

6) Nano-powder materials

Nanomaterials include nano-powder materials, nano-porous materials and nano-dense materials. The size of nano-powder particles is generally in the range of 1~100nm. The study of powder systems in this particle size range dates back to the birth of colloidal chemistry in the 1860s. In the 1940s, there were also reports of powder with this particle size range, but it was called ultra-fine powder, and the particle size range was defined as 0.01~0.1μm.