Tantalum materials, tantalum products and their production methods, more specifically, tantalum materials, tantalum products and their production methods, relate to tantalum materials, tantalum products and their production methods, which are used for slow grain growth, stable microstructure, good mechanical properties and long service life under high temperature conditions.
Tantalum is a rare metal with high melting point, corrosion resistance, good plasticity and high chemical activity. Based on the above characteristics of tantalum, tantalum materials and tantalum products are often used in high temperature situations requiring good strength and stiffness, such as heaters, heat insulation parts, charging vessels, supporting parts and other high temperature raw materials in the furnace. Various products made from ordinary tantalum materials, such as crucible, heater, heat shield, etc., have a short service life. Tantalum is an active metal, and all the so-called gap elements such as oxygen, carbon, nitrogen and hydrogen will enter tantalum material and become impurities under the action of a certain temperature and time. When common tantalum is used for a long time above its recrystallization temperature, due to the limited purity of the active gas in the furnace, the escape of some gas elements after the heat absorption of the treated material, and the characteristics of tantalum material when it is heated and aspirated, The gas impurities that protect the gas in the furnace and the gas impurities that escape from the materials are adsorbed on the surface of tantalum fittings in the furnace. Oxygen and hydrogen adsorbed on the surface of tantalum fittings in the furnace are converted into oxygen and hydrogen atoms in adsorbed state and dissolved in tantalum crystals. Under the action of high temperature for a long time, tantalum crystals carry accumulated oxygen and nitrogen atoms and thus widen the tantalum lattice, expand the volume and harden the grain. At the same time, under the combined action of oxygen, nitrogen, oxides and nitrous compounds in grain boundaries migrating along grain boundaries at high temperature for a long time, the grain boundaries are empty, crystal expansion, grain brittle and loose, and finally the furnace tantalum accessories are burned and brittle and discarded, which is extremely unfavorable to tantalum materials and their products with scarce resources and expensive prices.
The steps include: (1) Doping tantalum ingots by mixing rare earth elements into tantalum powder, sintering at high temperature or electron bombardment; (2) SGS tantalum plates are prepared from the obtained doped tantalum ingots through the forging, preliminary rolling, finishing rolling, cleaning and annealing processes; SGS tantalum products are produced by blanking, stamping, drawing, drilling, welding, riveting and turning using SGS tantalum materials as raw materials. The SGS tantalum products are tantalum accessories for high temperature vacuum furnaces; Tantalum accessories for high temperature vacuum furnaces include tantalum crucible, tantalum heater, tantalum heat shield, tantalum support frame, etc.
