Cobalt chromium molybdenum tungsten alloy fine spherical powder and preparation method thereof

Abstract

The invention discloses cobalt chromium molybdenum tungsten alloy fine spherical powder. The cobalt chromium molybdenum tungsten alloy fine spherical powder is characterized by comprising the following components in percentage by mass: 60-66% of cobalt, 24-27% of chromium, 5-6% of molybdenum, 5-6% of tungsten, 0-1.5% of silicon, and the balance of impurities. The preparation comprises the following steps: (S1) the precise weighing is performed according to the ratio of the needed formula; weighed raw materials are mixed in a medium-frequency induction furnace for smelting to obtain molten alloys; (S2) inert gas is heated by using a gas heating system; (S3) the molten alloys obtained in the step (S1) are poured in a tundish, and flow into an atomization nozzle through a liquid guide pipe; and the supersonic-speed gas atomization is performed on the molten metal by using hot air to obtain powder; and (S4) the obtained powder is screened to obtain the cobalt chromium molybdenum tungsten alloy fine spherical powder with the particle size of smaller than 30 microns. The cobalt chromium molybdenum tungsten alloy fine spherical powder achieves high relative density and excellent mechanical performances under the condition of relative lower cost, facilitates the popularization and the application of the SLM technology in the biomedical field, and achieves higher practicability.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a cobalt-chromium-molybdenum-tungsten alloy fine spherical powder and a preparation method thereof. Background technique [0002] Caries and periodontal disease are the most common oral diseases. The Chinese population suffers from caries slightly higher, and the oral health situation is not optimistic. Therefore, it is of great significance to study the preparation of dental substitute products and provide better restorations for patients with dental diseases. social benefits. [0003] Cobalt-chromium-molybdenum-tungsten alloy has good biocompatibility, strong metal-ceramic bonding and corrosion resistance, and is relatively cheap. It is widely used in the field of oral restoration. Due to the complex structure of oral restorations, traditional casting or Forming by forging method, the process is cumbersome, the cycle is long, the cost is high, and it is easy to ...

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Problems solved by technology

[0005] SLM technology has high requirements for metal powder. In addition to good plasticity, it must also meet the requirements of fine powder particle size, narrow particle size distribution, high sphericity, good fluidity and high bulk density. At present, domestically produced Cobalt-chromium-molybdenum-tungsten alloys basically have disadvantages such as large particle size, low sphericity, and high oxygen content, which cannot be used for SLM forming, which in turn affects the promotion and application of SLM technology in the biomedical field.