Hafnium-free high-anti-oxidation Nb-Si-based alloy and preparation method thereof
An oxidizing, base alloy technology, applied in the direction of mechanical equipment, blade support components, engine components, etc., can solve the problems of no high-temperature oxidation resistance of alloys, complex preparation process, high Hf density, etc., and achieve excellent high-temperature oxidation resistance , good mechanical properties and high thermal stability
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[0033] Example 1
[0034] Take high-purity various metals with 99.99wt.% Nb, 99.99wt.% Si, 99.8wt.% Ti, 99.9wt.% Cr, and 99.95wt.% Al as The raw material is prepared according to the composition ratio of Nb-14Si-20Ti-8Cr-3Al; the alloy is smelted in a WS-4 vacuum non-consumable electric arc furnace. When smelting, first vacuum to 6×10 -3 Below Pa, fill with argon to 0.4-0.6 atm, and then smelt under the protection of argon. To ensure uniform alloy composition, each alloy sample was smelted 5 times. The smelted alloy ingots are cut into appropriate sizes according to different needs, and homogenized heat treatment is performed at 1300°C in an argon atmosphere for 24 to 240 hours. Quench with ice water to obtain Nbss / Nb 5 Si 3 / Cr 2 Nb-Si-based superalloy material with Nb composite structure. The room temperature compressive strength of the alloy is 1957MPa (see image 3 Zhong 1# alloy), the oxidation weight gain of 100h exposure experiment in 1200℃ air is 99.9mg / cm 2 (See Figu...
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[0035] Example 2
[0036] Take high-purity various metals with 99.99wt.% Nb, 99.99wt.% Si, 99.8wt.% Ti, 99.9wt.% Cr, and 99.95wt.% Al as The raw materials are prepared according to the composition ratio of Nb-14Si-20Ti-8Cr-5Al; the alloy is smelted in a WS-4 vacuum non-consumable electric arc furnace. When smelting, first vacuum to 6×10 -3 Below Pa, fill with argon to 0.4-0.6 atm, and then smelt under the protection of argon. To ensure uniform alloy composition, each alloy sample was smelted 5 times. The smelted alloy ingots are cut into appropriate sizes according to different needs, and homogenized heat treatment is performed at 1300°C in an argon atmosphere for 24 to 240 hours. Quench with ice water to obtain Nbss / Nb 5 Si 3 / Cr 2 Nb-Si-based superalloy material with Nb composite structure. The room temperature compressive strength of the alloy is 2401MPa (see image 3 2# alloy), the oxidation weight gain of 100h exposure experiment in 1200℃ air is 22.8mg / cm 2 (See Figure 4...
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[0037] Example 3
[0038] Take high-purity various metals with 99.99wt.% Nb, 99.99wt.% Si, 99.8wt.% Ti, 99.9wt.% Cr, and 99.95wt.% Al as The raw materials are prepared according to the composition ratio of Nb-14Si-20Ti-8Cr-7Al; the alloy is smelted in a WS-4 vacuum non-consumable electric arc furnace. When smelting, first vacuum to 6×10 -3 Below Pa, fill with argon to 0.4-0.6 atm, and then smelt under the protection of argon. To ensure uniform alloy composition, each alloy sample was smelted 5 times. There are only Nbss phase and silicide phase (including -Nb 5 Si 3 And -Nb 5 Si 3 ) (See figure 1 ). The smelted alloy ingots are cut into appropriate sizes according to different needs, and subjected to homogenization heat treatment at 1300°C in an argon atmosphere for 24-240h. Quench with ice water to obtain Nbss / Nb 5 Si 3 / Cr 2 Nb composite tissue (see figure 2 ) Nb-Si-based superalloy material. The room temperature compressive strength of the alloy is 2253MPa (see image 3 M...
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