2results about How to "High Vickers hardness" patented technology

This invention discloses a method for removing metallic impurities from recycled tungsten alloys through arc refining and synergistic additive processes, belonging to the field of recycled tungsten alloy purification technology. The method includes: a first step, pretreatment; a second step, arc refining and synergistic additive impurity removal; a third step, cooling and forming; and a fourth step, post-treatment. This invention achieves highly efficient and thorough impurity removal, effectively removing various metallic impurities such as Fe, Cu, Al, Si, Mo, As, Pb, and Bi from recycled tungsten alloys. The finished product has a low total metallic impurity content and high purity, meeting the purity requirements of high-end applications for high-purity tungsten alloys.

The invention belongs to the technical field of carbon materials, and provides an sp2 hybridized nano composite carbon material with high hardness and superelasticity and a preparation method thereof, the carbon material is obtained by molding an sp2 hybridized carbon raw material under the action of temperature and pressure, in the forming process, the sp2 hybrid carbon raw material reacts to form a blocky structure mainly composed of amorphous carbon and crystal graphite clusters; the size distribution of the crystal graphite cluster is below 10nm; the mass ratio of sp2 hybrid carbon atoms in the blocky structure is more than 90%; the Vickers hardness value of the blocky structure is 20 GPa or above, the indentation elastic recovery rate is 90% or above, the initial oxidation temperature is about 900 DEG C or above, the room-temperature conductivity is 1 * 10 < 5 > S / m or above, and the blocky structure has wide application prospects in the fields of micro-nano electronic devices, aerospace and the like. The method disclosed by the invention is rich in raw material source, simple to operate and easy in condition control, and has the potential of industrial large-scale production.