Molybdenum-aluminum-silicon intermediate alloy and preparation method thereof

Abstract

The invention provides a molybdenum-aluminum-silicon intermediate alloy and a preparation method thereof. The molybdenum-aluminum-silicon intermediate alloy comprises the following components with contents in mass: 62wt%-68wt% of Mo, 4wt%-6wt% of Si and the balance Al. According to the molybdenum-aluminum-silicon intermediate alloy, through design for alloy components, the melting point and the density of the molybdenum-aluminum-silicon intermediate alloy are approximate to those of a matrix sponge titanium, low component segregation is achieved, and when the molybdenum-aluminum-silicon intermediate alloy is used for TC8 titanium alloy melting by replacing AlMo60 and metal Si, the melting point difference and the density difference between the molybdenum-aluminum-silicon intermediate alloyand the matrix sponge titanium can be reduced, so that the occurrence of component segregation due to high melting point difference and high density difference is effectively prevented. Experimentalresults indicate that the melting point of the molybdenum-aluminum-silicon intermediate alloy is 1565-1627 DEG C, the density is 4.88-5.33g / cm<3>, and low component segregation is achieved. The experimental results indicate that high uniformity of Si element and Mo element in a TC8 titanium alloy can be guaranteed by using the molybdenum-aluminum-silicon intermediate alloy for the TC8 titanium alloy. The preparation method is simple, easy to control, and applicable to large-scale industrial production.

Description

technical field

[0001] The invention relates to the technical field of metal materials, and relates to a master alloy, in particular to a molybdenum-aluminum-silicon master alloy and a preparation method thereof. Background technique

[0002] TC8 is a martensitic α+β two-phase deformation heat-strength titanium alloy. Its nominal composition is Ti-6.5Al-3.5Mo-0.25Si. The titanium alloy has good comprehensive tensile properties at room temperature and high temperature, especially at 500 ℃ has excellent thermal stability, durability and fatigue resistance, etc. As a compressor part of an aero-engine, it can work at 500 ℃ for more than 6000h. The alloy can be processed into bars, forgings, die forgings and other products, and is widely used in various turbine engines.

[0003] The raw materials currently used in the production of TC8 titanium alloy are except for the matrix sponge titanium (melting point: 1675°C, density: 4.50g / cm 3 ), also includes AlMo60 (melting point: 157...

Examples

Embodiment 1

[0023] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 110° C., and the drying time is 6 hours.

[0024] 2. Then follow 100 copies of MoO 3 , 65 parts of Al, and 5 parts of Si were weighed for each raw material.

[0025] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0026] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0027] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminum...

Embodiment 2

[0029] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 130° C., and the drying time is 12 hours.

[0030] 2. Then follow 100 copies of MoO 3 , 72 parts of Al, and 9 parts of Si were weighed for each raw material.

[0031] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0032] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0033] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminu...

Embodiment 3

[0035] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 120° C., and the drying time is 10 h.

[0036] 2. Then follow 100 copies of MoO 3 , 68 parts of Al, and 7 parts of Si were weighed for each raw material.

[0037] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0038] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0039] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminum-si...

technical field

[0001] The invention relates to the technical field of metal materials, and relates to a master alloy, in particular to a molybdenum-aluminum-silicon master alloy and a preparation method thereof. Background technique

[0002] TC8 is a martensitic α+β two-phase deformation heat-strength titanium alloy. Its nominal composition is Ti-6.5Al-3.5Mo-0.25Si. The titanium alloy has good comprehensive tensile properties at room temperature and high temperature, especially at 500 ℃ has excellent thermal stability, durability and fatigue resistance, etc. As a compressor part of an aero-engine, it can work at 500 ℃ for more than 6000h. The alloy can be processed into bars, forgings, die forgings and other products, and is widely used in various turbine engines.

[0003] The raw materials currently used in the production of TC8 titanium alloy are except for the matrix sponge titanium (melting point: 1675°C, density: 4.50g / cm 3 ), also includes AlMo60 (melting point: 157...

Examples

Embodiment 1

[0023] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 110° C., and the drying time is 6 hours.

[0024] 2. Then follow 100 copies of MoO 3 , 65 parts of Al, and 5 parts of Si were weighed for each raw material.

[0025] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0026] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0027] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminum...

Embodiment 2

[0029] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 130° C., and the drying time is 12 hours.

[0030] 2. Then follow 100 copies of MoO 3 , 72 parts of Al, and 9 parts of Si were weighed for each raw material.

[0031] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0032] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0033] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminu...

Embodiment 3

[0035] 1. MoO with a purity of more than 99.9% 3 , Al with a purity of 99.7% or more and Si with a purity of 99.5% or more are dried, the drying temperature is 120° C., and the drying time is 10 h.

[0036] 2. Then follow 100 copies of MoO 3 , 68 parts of Al, and 7 parts of Si were weighed for each raw material.

[0037] 3. Fully mix the weighed raw materials to obtain the mixed material.

[0038] 4. Put the mixed material in a furnace at normal temperature, and carry out alloy smelting by the aluminothermic smelting method outside the furnace to obtain a molybdenum-aluminum-silicon intermediate alloy.

[0039] The chemical composition of the molybdenum-aluminum-silicon master alloy prepared in this example was analyzed, and the results are shown in Table 1. The molybdenum-aluminum-silicon master alloy prepared in this example was applied to the grade TC8 titanium alloy for Mo content and Si content analysis, and the results are shown in Table 2. The molybdenum-aluminum-si...

Images