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A kind of nb-si intermetallic compound bar and preparation method thereof

An intermetallic compound and rod technology, which is applied in the field of intermetallic compound preparation, can solve the problem that the superior properties of Nb-Si intermetallic compounds cannot be fully exerted, the melting point and high temperature mechanical properties of Nb-Si intermetallic compounds are reduced, and they are not perfect. Nb-Si intermetallic compounds and other problems, to achieve the effect of reducing oxygen content, reducing sintering temperature, and uniform composition distribution

Inactive Publication Date: 2017-05-10
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation of Nb-Si intermetallic compounds by conventional powder metallurgy and smelting methods, the Nb 5 Si 3 Not according to the stoichiometric ratio, low melting point impurity elements tend to occupy these vacancies and form imperfect Nb-Si intermetallic compounds; at the same time, impurity elements are also easy to form solid solutions with Nb-Si intermetallic compounds; on the other hand, using existing technology to prepare The Nb-Si intermetallic process inevitably forms the unstable Nb phase with low melting point 3 Si, even through high vacuum and high temperature long time (1800℃×100h) heat treatment, it is difficult to convert unstable Nb 3 Si to Nb 5 Si 3 , these factors lead to a decline in the melting point and high-temperature mechanical properties of Nb-Si intermetallic compounds, which prevents the superior performance of Nb-Si intermetallic compounds from being fully utilized, limiting its further application range

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  • A kind of nb-si intermetallic compound bar and preparation method thereof
  • A kind of nb-si intermetallic compound bar and preparation method thereof

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Embodiment 1

[0026] In this embodiment, the Nb-Si intermetallic compound rod is made of the following atomic percentages of raw materials: 40% silicon, and the balance being niobium and unavoidable impurities.

[0027] The method for preparing the Nb-Si intermetallic compound rod in this embodiment comprises the following steps:

[0028] 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 speed of 350 rpm and a ball-to-material ratio of 8:1 by mass ratio. Dry to obtain mixed powder; the volume of the absolute ethanol is 0.8 times the sum of the mass of silicon powder and niobium powder, wherein the unit of volume is mL, and the unit of mass is g; the drying temperature is preferably 95°C ; Preferably, the mass purity of the silicon powder is not less than 99%, and the mass purity of the niobium powder is not less than 99%;

[0029] Step 2. Compress the mixed powder described in step 1 to obtain a billet, and t...

Embodiment 2

[0034] The Nb-Si intermetallic compound rod in this embodiment is made of the following atomic percentages: silicon 37%, the balance being niobium and unavoidable impurities.

[0035] The method for preparing the Nb-Si intermetallic compound rod in this embodiment comprises the following steps:

[0036] Step 1. Put silicon powder and niobium powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 30 hours at a rotational speed of 300rpm and a ball-to-material ratio of 10:1 by mass. Dry to obtain mixed powder; the volume of the absolute ethanol is equal to the sum of the mass of silicon powder and niobium powder, wherein the unit of volume is mL, and the unit of mass is g; the drying temperature is preferably 90°C; preferably Specifically, the mass purity of the silicon powder is not less than 99%, and the mass purity of the niobium powder is not less than 99%;

[0037] Step 2. Compress the mixed powder described in step 1 to obtain a billet, and then pl...

Embodiment 3

[0042] In this embodiment, the Nb-Si intermetallic compound rod is made of the following atomic percentages of raw materials: silicon 43%, the balance being niobium and unavoidable impurities.

[0043] The method for preparing the Nb-Si intermetallic compound rod in this embodiment comprises the following steps:

[0044] 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 speed of 400 rpm and a ball-to-material ratio of 5:1 by mass ratio. Dry to obtain mixed powder; the volume of the absolute ethanol is 0.5 times the sum of the mass of silicon powder and niobium powder, wherein the unit of volume is mL, and the unit of mass is g; the drying temperature is preferably 100°C ; Preferably, the mass purity of the silicon powder is not less than 99%, and the mass purity of the niobium powder is not less than 99%;

[0045] Step 2. Compress the mixed powder described in step 1 to obtain a billet, and then...

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Abstract

The invention discloses an Nb-Si intermetallic compound bar. The Nb-Si intermetallic compound bar is prepared from, by atomic percentage, 35%-45% of silicon, and the balance niobium and inevitable impurities. The invention further discloses a preparation method of the Nb-Si intermetallic compound bar. The preparation method includes the steps that 1, silicon powder and niobium powder are ball-milled and dried to obtain mixed powder; 2, a blank is formed after compression molding, the blank is sintered, and then an Nb-Si intermetallic compound sintered body is obtained; 3, an Nb-Si intermetallic compound cast ingot is obtained after electric arc melting, and a semi-finished bar is obtained after cutting; and 4, the Nb-Si intermetallic compound bar is obtained after electron beam zone melting. The Nb-Si intermetallic compound bar has the beneficial effects of being high in quality and purity, low in oxygen mass content and uniform in component distribution, the bar is further crushed into powder to serve as a raw material for preparing a high-temperature oxidation-resistant coating and also serve as a strengthening phase of a super-high-temperature oxidation-resistant material, and broad application prospects are achieved in the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of preparation of intermetallic compounds, and in particular relates to a Nb-Si intermetallic compound 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 maximu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C1/02C22C1/05
Inventor 喻吉良张如郑欣李来平张文裴雅夏明星王峰郭林江刘辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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