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What is the relationship between 3D printed block metallic glass and tungsten, molybdenum and rare earth?

  • Mosten
  • 4 Aug

Bulk metallic glasses (BMGs) produced by additive manufacturing (3D printing) are no longer limited by size and geometry, as they are generally suitable for as-cast samples. So, what is the relationship between BMGs and the most popular tungsten and molybdenum rare earths?

Molybdenum based glass and rare earth based glass are two common alloy systems at present, their strength and hardness are higher than steel, and have good thermal stability, toughness and rigidity, widely used in magnetic, biomedical, 3C electronics, automotive, aerospace, military, national defense and other fields.

The metallic glass coating applied to AISI 1035 steel was also doped with tungsten and molybdenum. The role of tungsten is to increase the high temperature oxidation resistance, wear resistance and electrochemical corrosion resistance of the coating to extend the service life of the steel.

However, limited floor space and manufacturing difficulties have limited the wide use of BMGs for many years. The emerging technology of 3D printing seems to be a promising way to remedy the shortcomings associated with metallic glass. At present, 3D printing technology has been successfully applied in the manufacturing of BMGs, including selective laser melting, laser engineering net sharpening, laser foil printing, fuse manufacturing, thermal spraying 3D printing and laser forward transfer 3D printing.

Research shows that the compressive strength of 3D-printed block metal glass is between 1000-2500mpa, the plasticity is between 0-5%, and the fracture toughness is between 20-40mpa M1/2. However, due to the occurrence of partial crystallization and structural relaxation in the HEAT affected zone, these values are less than those of the as-cast BMG with the same composition. To make up for this, the researchers show that a ductile second phase can be added to the glass to effectively inhibit the formation of microcracks.

3D-printed BMGs can be used as flexible gears and blades for use in outer space at extremely low temperatures; It can be used as a biomedical implant because of its excellent corrosion resistance, wear resistance and good biocompatibility. In addition, it can also degrade organic pollutants, because it has excellent catalytic performance.