6results 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 relates to the technical field of liquid metal materials, in particular to a liquid metal material and a preparation method thereof.The liquid metal material comprises, by mass, 10-18 parts of Cd, 10-20 parts of Pb, 25-30 parts of Bi, 4-17 parts of In, 5-15 parts of Al, 20-35 parts of Zn, 10-20 parts of Sn and 8-20 parts of Nb. The total mass fraction of Pb and Cd is greater than the mass fraction of Bi. The mass part ratio of Sn to Zn to Al is (10-14): (23-27): (6-10). The liquid metal material is solid at the temperature of 20-50 DEG C, can be melted at the temperature of 100 DEG C or above, can be melted at the high temperature and can be solidified at the low temperature, is used for underground plugging and casing annulus plugging, and is excellent in comprehensive performance.

The invention belongs to the technical field of electric contact materials, and relates to a nickel-containing AgZnO electric contact material and a preparation method thereof. The preparation method of the nickel-containing AgZnO electric contact material comprises the following steps: (1) preparing nickel-containing ZnO composite powder by adopting a sol-gel method; (2) adding Ag powder and the nickel-containing ZnO composite powder into a container, adding a solvent, carrying out ultrasonic mixing, and drying to obtain a mixture; (3) pressing the mixed material obtained in the step (2) into a blank, sintering for the first time in an inert atmosphere, and cooling to room temperature after sintering to obtain a prefabricated material; and (4) carrying out compression molding on the prefabricated material obtained in the step (3) again, carrying out secondary sintering in an inert atmosphere, and cooling to room temperature after sintering to obtain the nickel-containing AgZnO electric contact material. Compared with an AgZnO electric contact material prepared from ZnO, the density, the conductivity and the Vickers hardness of the obtained nickel-containing AgZnO electric contact material are increased by 2.8%, 13.5% and 28.8% respectively.

The present invention discloses a high mechanical property conductive WC / β-SiAlON composite ceramic tool material and a preparation method thereof, and belongs to the technical field of ceramic material preparation. The high mechanical property conductive WC / β-SiAlON composite ceramic tool material of the present invention, in terms of volume percentage, comprises raw materials including: 70-80% β-SiAlON ceramic powder and 20-30% WC powder. The WC / β-SiAlON composite ceramic tool material of the present invention has good electrical conductivity and high mechanical properties, with its resistivity being reduced to 0.64Ω·m, its Vickers hardness being up to 17.23±0.29GPa, and its fracture toughness being up to 7.09±0.14MPa·m 1 / 2 Compared with pure β-SiAlON ceramics without the addition of a second phase, the resistivity decreases by about 10 10 times, the Vickers hardness increased by 4.68%, and the fracture toughness increased by 4.11%.

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.

The present invention belongs to the technical field of silicon nitride ceramics, and specifically relates to a silicon nitride ceramic tool and a preparation method thereof. The preparation method comprises the following steps: firstly weighing the following components by weight percentage: 75%-85% silicon nitride powder, 10%-16% pre-oxidized silicon nitride powder and ZrO 2 ‑Y 2 O 3 5%-10% of the powder is stirred with water and ethanol to prepare a ceramic slurry; the ceramic slurry is sprayed in a hot air flow, granulated, dried, ground, and sieved to obtain a ceramic powder; the ceramic powder is pressed into a shape to obtain a ceramic body; the ceramic body is sintered to obtain a silicon nitride ceramic tool. The silicon nitride ceramic tool obtained by the present invention has a Vickers hardness of 21.6-27.5GPa and a fracture toughness of 12.7-15.8MPa·m 1 / 2 , the flexural strength is 1053‑1290MPa.