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Preparation method for medium- and high-strength niobium alloy powder with intracrystalline-strengthened nano-scale carbide

A carbide and niobium alloy technology is applied in the field of preparation of nano-carbide intragranular strengthening type medium and high-strength niobium alloy powder, which can solve problems such as inability to achieve, and achieve the effects of improving strengthening effect, improving uniformity and improving strength.

Active Publication Date: 2019-10-22
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

At present, my country's current industrial production equipment cannot meet the requirements of the above two processes

Method used

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  • Preparation method for medium- and high-strength niobium alloy powder with intracrystalline-strengthened nano-scale carbide
  • Preparation method for medium- and high-strength niobium alloy powder with intracrystalline-strengthened nano-scale carbide
  • Preparation method for medium- and high-strength niobium alloy powder with intracrystalline-strengthened nano-scale carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment includes the following steps:

[0039] Step 1. Put 2.2kg of FNbC-1 powder with a specification of 30 into the planetary ball mill in batches, and run it at a speed of 1000r / min for 1h to obtain niobium carbide powder with a Fischer average particle size of 0.08μm. Put 2kg of FNbC-1 powder with a specification of 30 The FNbC-1 powder was put into the planetary ball mill in batches and operated at a speed of 1200r / min for 1h to obtain niobium carbide powder with a Fischer average particle size of 0.08μm, and then the above two sources of niobium carbide powder were mixed with 78.8kg of Nb1 powder, 10kg of FW-1 powder, 5.3kg of FMo-1 powder, 1.7kg of ZrH 2 The powder is put into the ball mill cylinder of the rolling ball mill (the inner diameter of the ball mill cylinder is 600 mm), and then 200 kg of hard alloy ball milling balls with a diameter of 15 mm and 2500 mL of absolute ethanol are added, and the rotating speed of the ball mill cylinder is adjusted...

Embodiment 2

[0069] This embodiment includes the following steps:

[0070] Step 1. Mix 4.1kg of FNbC-2 powder with a specification of 10, 78.5kg of Nb1 powder, 4.5kg of FW-1 powder, 11.7kg of FMo-1 powder, and 1.3kg of ZrH 2 Put the powder into the ball mill cylinder of the rolling ball mill (the inner diameter of the ball mill cylinder is 600mm), then add 200kg of cemented carbide balls with a diameter of 15mm and 1800mL of gasoline, adjust the speed of the ball mill cylinder to 48r / min for rolling ball milling for 48h, and let stand for 16h After taking out to obtain ball mill powder;

[0071] Step 2. Put the ball-milled powder obtained in Step 1 into a vacuum dryer, and vacuum-dry it at a temperature of 50°C to 140°C to obtain a medium-high-strength niobium alloy powder of a nano-carbide intragranular strengthening type; the nanometer The carbide intragranular strengthening type medium and high strength niobium alloy powder is composed of the following components in mass percentage: W ...

Embodiment 3

[0079] This embodiment includes the following steps:

[0080] Step 1. Mix 0.7kg of FNbC-3 powder with specification 15, 63.3kg of Nb1 powder, 30kg of FW-1 powder, 2.5kg of FMo-1 powder, and 3.5kg of ZrH 2 Put the powder into the ball milling cylinder of the rolling ball mill (the inner diameter of the ball milling cylinder is 600mm), then add 200kg of hard alloy balls with a diameter of 15mm and 1800mL of absolute ethanol, adjust the rotating speed of the ball milling cylinder to 48r / min and carry out rolling ball milling for 24h, statically Take out after putting for 12h and obtain ball mill powder;

[0081] Step 2. Put the ball-milled powder obtained in Step 1 into a vacuum dryer, and vacuum-dry it at a temperature of 50°C to 140°C to obtain a medium-high-strength niobium alloy powder of a nano-carbide intragranular strengthening type; the nanometer The carbide intragranular strengthened medium-high-strength niobium alloy powder is composed of the following components in ma...

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Abstract

The invention discloses a preparation method for a medium- and high-strength niobium alloy powder with an intracrystalline-strengthened nano-scale carbide. According to the method, NbC powder with a mass purity of greater than 99.95% and an average Fisher particle size of less than 3[mu]m is taken as a strengthening phase, the NbC powder and other alloy element powders are subjected to wet-millingand uniform mixing in a rolling ball-milling method, and then are dried, so that the medium- and high-strength niobium alloy powder with the intracrystalline-strengthened nano-scale carbide is obtained. According to the method, the NbC powder with a low particle size is adopted, the medium- and high-strength niobium alloy powder with the intracrystalline-strengthened nano-scale carbide is prepared through rolling ball-milling, and the carbide in a niobium alloy is subjected to second-phase refining and mostly distributed into crystals to form the nano-scale carbide, so that the strengtheningeffect of NbC is improved, then the strength of the niobium alloy is increased, the problem of difficulty to break and homogenize due to that a carbide is large in size and mostly distributed in a mesh shape along crystal boundaries, in a common preparation method for a niobium alloy with the strengthened carbide, is solved, and the insufficiency of the capacity of processing equipment is made up.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of nano-carbide inner-strengthened medium-high-strength niobium alloy powder. Background technique [0002] Niobium alloy is the alloy with the smallest density among refractory alloys (tungsten, molybdenum, tantalum, and niobium alloys), and has good ductility, toughness, and weldability. Niobium can be solid-soluble with most elements, and has a large solid solubility, forming a variety of alloy grades in different working conditions, and it is irreplaceable in the application of aerospace structural parts. Medium and high-strength niobium alloys are mainly solid-solution strengthened by adding more elements such as W, Mo, Ta, V, Ti, Hf, and at the same time, adding a small amount of active elements such as Ti, Zr, Hf and C elements to form a carbide strengthening phase; The C element in this type of alloy can form the second phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C27/02C22C32/00
CPCB22F9/04B22F2009/041B22F2009/042B22F2009/043C22C27/02C22C32/0052
Inventor 郑欣蒋丽娟喻吉良王峰刘辉白润蔡小梅夏明星薛建嵘
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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