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Method for preparing injection-molding nickel-base ODS (oxide dispersion strengthened) alloy

An injection molding, nickel-based alloy technology, applied in the field of powder injection molding, can solve the problems of irregular shape of mechanical alloy powder, unsuitable for injection molding, powder agglomeration, etc., to expand high-temperature mechanical properties, avoid non-metallic inclusions, particle size small effect

Active Publication Date: 2011-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Mechanical alloying is an essential process for preparing nickel-based ODS alloy powder raw materials for injection molding, but mechanical alloy powders are not suitable for injection molding due to irregular shape, powder agglomeration and coarse particle size

Method used

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  • Method for preparing injection-molding nickel-base ODS (oxide dispersion strengthened) alloy
  • Method for preparing injection-molding nickel-base ODS (oxide dispersion strengthened) alloy
  • Method for preparing injection-molding nickel-base ODS (oxide dispersion strengthened) alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of Injection Molded Nickel-based ODS Alloy Without γ′ Phase Reinforcement Using Jet Milled Powder as Raw Material

[0027] Y with a particle size of 20-30nm 2 o 3 Granules, and high-purity Ni powder, Cr powder, Co powder, Mo powder, W powder, Fe powder, Si powder, Hf powder and C powder are raw materials, and the mixed powder is prepared according to the following mass percentages: 21% Cr, 1.5% Co, 9% Mo, 0.5% W, 18% Fe, 0.8% Si, 0.09% C, 1% Y 2 o 3 , 1.2% Hf and the balance Ni. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3 The particles are uniformly dispersed in the Ni matrix, the speed of the ball mill is 380 rpm, and the ball milling time is 40 hours; the mechanical alloy powder is crushed and refined by a jet mill, the air pressure is 6MPa, and the sorting energy frequency is 45Hz, and the average particle size is about 20μm powder; airflow milled powder and binder are e...

Embodiment 2

[0028] Example 2: Using plasma spheroidized powder as raw material to prepare injection-molded nickel-based ODS alloy without γ′ phase reinforcement

[0029] Y with a particle size of 20-30nm 2 o 3 Granules, and high-purity Ni powder, Cr powder, Co powder, Mo powder, W powder, Fe powder, Si powder, Hf powder and C powder are raw materials, and the mixed powder is prepared according to the following mass percentages: 19% Cr, 2% Co, 8% Mo, 1% W, 19% Fe, 0.6% Si, 0.08% C, 1% Y 2 o 3 , 1.2% Hf and the balance Ni. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3 The particles are evenly dispersed in the Ni matrix, the speed of the ball mill is 450 rpm, and the ball milling time is 48 hours; the mechanical alloy powder is crushed and refined by a jet mill, the air pressure is 8MPa, and the sorting energy frequency is 50Hz, and the average particle size is about 30μm powder; the jet milled powder is subjected to plas...

Embodiment 3

[0030] Example 3: Preparation of γ′ and oxide co-reinforced nickel-based ODS alloy for injection molding with jet mill fine powder

[0031] Y with a particle size of 20-30nm 2 o 3 Particles, and high-purity Ni powder, Cr powder, Nb powder, Mo powder, Ti powder, Al powder, Fe powder, Si powder, Hf powder and C powder are raw materials, and the mixed powder is prepared according to the following mass percentage: 18% Cr , 5% Nb, 3% Mo, 0.4% Al, 1% Ti, 19% Fe, 0.3% Si, 0.36% C, 1% Y 2 o 3 , 1.2% Hf and the balance Ni. First, the mixed powder was subjected to high-energy ball milling in a high-purity Ar atmosphere to make Y 2 o 3 The particles are evenly dispersed in the Ni matrix, the speed of the ball mill is 400 rpm, and the ball milling time is 60 hours; the mechanical alloy powder is crushed and refined by a jet mill, the air pressure is 5MPa, and the sorting energy frequency is 40Hz, and the average particle size is about 35μm powder; jet mill fine particle powder and b...

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Abstract

The invention provides a method for preparing a nickel-base ODS (oxide dispersion strengthened) alloy by injection molding, belonging to the technical field of injection molding of powder. The method comprises the following steps: carrying out high-energy ball milling on the raw material powder so that Y2O3 particles are uniformly dispersed in a nickel substrate, refining mechanical alloy powder by jet milling, and carrying out plasma nodularization on the powder which is refined by jet milling; evenly mixing and smelting the powder, which is refined by jet milling and plasma nodularization, and adhesive to obtain a uniform feed material; and carrying out injection molding, two-step degreasing and sintering on the feed material to obtain a sintered blank of which the density is 93-96%, carrying out hot isostatic compaction on the sintered blank so that the sintered blank is completely compact, and finally, carrying solution heat treatment and aging heat treatment to obtain the injection-molding nickel-base ODS alloy. The nickel-base ODS alloy can be prepared into high-precision parts in complex shapes, thereby solving the problem of difficulty in molding of nickel-base ODS alloy. The gamma' phase and the oxide strengthening mechanism are combined to greatly enhance the high-temperature mechanical properties of the nickel-base ODS alloy.

Description

technical field [0001] The invention belongs to the technical field of powder injection molding, and in particular provides a method for preparing an injection molding nickel-based oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS) alloy by using pretreated mechanical alloying powder as a raw material. Background technique [0002] Nickel-based ODS alloys still have excellent high-temperature creep properties, fatigue properties and oxidation resistance above 1000 °C. The medium-temperature (700-900°C) strength of nickel-based alloys is low, and L1 is formed by adding elements such as Al, Ti, and Nb. 2 The structure of γ′[Ni 3 (Al, Ti)] precipitates can effectively improve the medium temperature strength. At higher temperatures (>1000°C), the γ′ phase loses its strengthening effect due to dissolution, and the dispersion strengthening mechanism of stable oxides dominates at this time. The nickel-based ODS alloy strengthened by γ′ phase and oxide disper...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C19/03
Inventor 章林刘烨何新波曲选辉秦明礼
Owner UNIV OF SCI & TECH BEIJING
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