Titanium and aluminum based alloy powder material for additive manufacturing and preparation method thereof

Abstract

The invention provides a titanium and aluminum based alloy powder material for additive manufacturing. The titanium and aluminum based alloy powder material is prepared from the following raw materials in percentage by atom: 47 to 56 percent of Al, 1.6 to 2.3 percent of Cr, 1.6 to 2.0 percent of Mo, 0.6 to 1.2 percent of TiB2 and the balance of Ti and unavoidable impurity. In addition, the invention also provides a method for preparing the alloy powder material. The method comprises the following steps of I, protecting the inner wall of a graphite flow guiding pipe by adopting a ceramic flow guiding inner core; II, preparing high-temperature-preventing carbonized coatings at the end surfaces of the graphite flow guiding pipe and then loading the graphite flow guiding pipe into a smelting chamber; III, preparing an ingot blank by adopting vacuum self-consuming arc smelting; IV, smelting to prepare an alloy melt by adopting a water-cooled copper crucible; V, carrying out atomization treatment, so that the titanium and aluminum based alloy powder material for the additive manufacturing is obtained. The alloy powder material is an alloy system designed for the additive manufacturing process and various properties of a product manufactured through the additive manufacturing technique by adopting the alloy powder material can reach expected effects.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing and powder metallurgy, and in particular relates to a titanium-aluminum-based alloy powder material for additive manufacturing and a preparation method thereof. Background technique [0002] The development of the aerospace and automobile industries has put forward more stringent requirements on the performance of key parts such as engine blades and turbochargers. Intermetallic compound materials represented by TiAl-based alloys have both metallic bonds and covalent bonds. It has the toughness of metal materials and the high-temperature performance of ceramics. It has low density, excellent oxidation resistance, and good high-temperature specific strength. It has become the most promising new generation of high-temperature structural materials. However, due to the long-range ordered structure and crystal structure of TiAl intermetallic compounds, their room temperature plasticity an...

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Problems solved by technology

However, none of the above patents has an alloy system designed for the additive manufacturing process. They are all original casting or forging component systems. Powder system and preparation method of

Foreign countries strictly protect and keep secret the spherical powder for additive manufacturing aero-engine including spherical titanium alloy powder, its component system and manufacturing method, and there is no public report. Some spherical metal powders of conventional systems have adopted a limited export policy. The price of powder raw materials has been greatly increased, and the supply cycle has been extended, which has seriously restricted the development of my country's related additive manufacturing industries.

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