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A kind of nb-si-c alloy rod and preparation method thereof

An alloy bar, nb-si-c technology, applied in the field of Nb-Si-C alloy bar and its preparation, can solve problems such as limited prospects, and achieve lower sintering temperature, high melting point, high high temperature strength and high temperature creep. The effect of changing performance

Active Publication Date: 2020-02-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-temperature mechanical properties and fatigue strength of niobium alloys can be improved to a certain extent through alloying modification, the prospect of greatly improving its mechanical properties so that it can be applied in ultra-high temperature environments is limited

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  • A kind of nb-si-c alloy rod and preparation method thereof
  • A kind of nb-si-c alloy rod and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The Nb-Si-C alloy rod in this embodiment is made of the following atomic percentages of raw materials: 15% silicon, 10% carbon, and the balance being niobium and unavoidable impurities.

[0026] The method for preparing Nb-Si-C alloy rods in this embodiment comprises the following steps:

[0027] Step 1. Put silicon powder and niobium powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 20 hours at a rotational speed of 250 rpm and a ball-to-material ratio of 10:1 by mass. Dry under vacuum condition, obtain mixed powder; The volume of described dehydrated alcohol is 3 times of the total mass of silicon powder, carbon powder and niobium powder, and the unit of volume of dehydrated alcohol is mL, and the total mass of silicon powder, carbon powder and niobium powder The unit of mass is g; the mass purity of the silicon powder is not less than 99.5%, the mass purity of the carbon powder is not less than 99.5%, and the mass purity of the niobium po...

Embodiment 2

[0033] The Nb-Si-C alloy rod in this embodiment is made of the following atomic percentages: silicon 12%, carbon 8%, and the balance being niobium and unavoidable impurities.

[0034] The method for preparing Nb-Si-C alloy rods in this embodiment comprises the following steps:

[0035] Step 1. Put silicon powder and niobium powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 15 hours at a rotational speed of 200 rpm and a ball-to-material ratio of 8:1 by mass. Drying under vacuum condition, obtain mixed powder; The volume of described dehydrated alcohol is 2 times of the total mass of silicon powder, carbon powder and niobium powder, and the unit of volume of dehydrated alcohol is mL, and the total mass of silicon powder, carbon powder and niobium powder is 2 times. The unit of mass is g; the mass purity of the silicon powder is not less than 99.5%, the mass purity of the carbon powder is not less than 99.5%, and the mass purity of the niobium powder...

Embodiment 3

[0041] The Nb-Si-C alloy rod in this embodiment is made of the following atomic percentages: silicon 18%, carbon 12%, and the balance being niobium and unavoidable impurities.

[0042] The method for preparing Nb-Si-C alloy rods in this embodiment comprises the following steps:

[0043] Step 1. Put silicon powder and niobium powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 25 hours at a rotational speed of 300 rpm and a ball-to-material ratio of 12:1 by mass. Drying under vacuum condition, obtain mixed powder; The volume of described dehydrated alcohol is 4 times of the total mass of silicon powder, carbon powder and niobium powder, and the unit of volume of dehydrated alcohol is mL, and the total mass of silicon powder, carbon powder and niobium powder is 4 times. The unit of mass is g; the mass purity of the silicon powder is not less than 99.5%, the mass purity of the carbon powder is not less than 99.5%, and the mass purity of the niobium powd...

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Abstract

The invention discloses a Nb-Si-C alloy bar which is prepared from, 10-20% of silicon, 5-15% of carbon and the balance niobium and inevitable impurities. The invention further discloses a method for preparing the Nb-Si-C alloy bar. The method comprises the steps that silicon powder, carbon powder and niobium powder are dried after being subjected to ball milling to obtain mixed powder; 2, the mixed powder is pressed to form a blank and sintered to obtain a Nb-Si-C sintered body; 3, a Nb-Si-C cast ingot is obtained through electric arc melting and cut to be a semi-finished bar; and 4, electronic beam area smelting is carried out to obtain the Nb-Si-C alloy bar. The prepared Nb-Si-C alloy bar is composed of Nb5Si3C compound, has high purity, low impurity oxygen mass content, high hardness, high strength, high temperature resistance and excellent fatigue performance, and has the wide application prospect in the fields of aerospace, national defence industry, pressure processing, mechanical machining cutting tools and the like.

Description

technical field [0001] The invention belongs to the technical field of alloy rod preparation, and in particular relates to a Nb-Si-C alloy rod and a preparation method thereof. Background technique [0002] The development of high-performance aircraft depends on the matching of advanced engines. Modern aerospace engines not only have high thrust, but also continuously improve the thrust-to-weight ratio. With the improvement of engine thrust and efficiency, the temperature of the turbine inlet of the engine needs to be continuously increased. Among the turbine engine components, the working conditions of the turbine blades are the most severe. Long service life requires turbine blade materials to have high creep resistance, good corrosion resistance, high high temperature durability, fracture toughness and fatigue performance. The nickel-based and cobalt-based superalloy materials currently used in gas turbine engines have reached their maximum service temperature limit, tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C1/02
CPCC22C1/02C22C27/02
Inventor 喻吉良王晖张如刘辉张文李来平郑欣李延超
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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