Mo-Si-Al-K hot-rolled high-heat molybdenum plate and preparation method thereof

Abstract

The invention relates to a Mo-Si-Al-K hot rolling high temperature molybdenum plate and a preparation method thereof. The invention is characterized in that alloy in plate materials contain three oxides of K2O, SiO2 and Al2O3. The weight percentage of the three oxides in the molybdenum alloy is 0.01 to 0.08 percent of K2O, 0.02 to 0.05 percent of SiO2 and 0 to 0.005 percent of Al2O3. The preparation process is: adding K2SiO3 and Al (NO3)3.9H2O solution in molybdenum dioxide; implementing the hydrogen reduction on the solution after the vacuum drying and doping to obtain Mo-Si-Al-K doping molybdenum powder; implementing the cold isostatic pressing on the Mo-Si-Al-K doping molybdenum powder to make sintering high temperature molybdenum billet; rolling the Mo-Si-Al-K sintering high temperature molybdenum billet into the high temperature molybdenum plate. Raw materials of the invention are cheap and are easy to be obtained. The prepared molybdenum plate has the advantages of strong high temperature strength, simple process, and unyieldingness, high ratio of finishing product, good consistency and long service life and can be widely used as a boat, a heating unit, a heat shield and other structural parts for the high temperature reduction.

Description

technical field [0001] The invention relates to a Mo-Si-Al-K hot-rolled high-temperature molybdenum plate and a preparation method thereof. Background technique [0002] Because refractory metal molybdenum has high high temperature strength, good electrical and thermal conductivity, low expansion coefficient and easy processing, it is used in special bulbs and electric light source devices such as automotive tungsten halogen lamps, high-pressure sodium lamps, lighting tungsten halogen lamps, etc. Molybdenum wire is widely used to manufacture parts such as bulb hooks, core wires for winding filaments, guide rods, lead-out wires and plastic brackets. It is widely used as wire-cut molybdenum wire in the metal processing industry, and in the kiln industry. Used as a heating element for hydrogen furnaces. However, in parts with high temperature performance requirements, such as boats for powder metallurgy reduction, high temperature lamp support wires, high temperature electric ...

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Problems solved by technology

However, in parts with high temperature performance requirements, such as boats for powder metallurgy reduction, high temperature lamp support wires, and high temperature electric furnace (under gas protection or vacuum) heating elements, molybdenum plates need to have good high temperature performance. The recrystallization temperature of molybdenum plate is only 1000-1200°C, so brittleness and fracture often occur, and its high-temperature strength is also low and easy to deform, which is far from meeting the requirements of the above industries.