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Preparation method of MoNiB metal ceramic thread element

A technology of threaded components and cermets, which is applied in the direction of engine components, other manufacturing equipment/tools, turbines, etc., can solve the problems of non-durability and uneconomical, and achieve the effect of uniform distribution, high bending strength and good compatibility

Pending Publication Date: 2021-06-04
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the preparation of corrosion-resistant and wear-resistant coating threaded elements on the surface of the steel base with slurry has certain limitations. It is neither economical nor durable to use as a whole material.

Method used

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  • Preparation method of MoNiB metal ceramic thread element
  • Preparation method of MoNiB metal ceramic thread element

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preparation example Construction

[0034] A preparation method of a MoNiB cermet screw element, comprising the following steps:

[0035] Step 1, with nickel-chromium alloy powder, molybdenum boride alloy powder, nickel boride alloy powder, molybdenum powder, Cr 2 C 3 Or VC or TiC powder, nickel powder as raw materials, and add a binder for ball milling, and then dry and sieve to obtain Mo-Ni-B metal mixed powder;

[0036] Among them, according to the mass percentage, the content of each raw material is: 12.5-27.5% nickel-chromium alloy powder, 40.0-60.0% molybdenum boride alloy powder, 0.5-2.5% nickel boride alloy powder, 0.1-15.0% molybdenum powder, 1.0- 3.0%Cr 2 C 3 / VC / TiC powder and the rest of nickel powder, plus an adhesive of 1.5-5.5% by mass of the above-mentioned raw materials, the adhesive is paraffin, polyvinyl alcohol or methyl cellulose;

[0037] During ball milling, a liquid hydrocarbon solvent is added to the raw material. The liquid hydrocarbon solvent is one or more of n-hexane, n-heptane, ...

Embodiment 1

[0049] Step 1a: Mix 40.0% molybdenum boride alloy powder, 2.0% nickel boride alloy powder, 16.0% nickel-chromium alloy powder, 13.0% Mo powder, and 2.0% VC nickel powder in the balance by mass percentage, plus the total mass of the above-mentioned raw materials 2.5% paraffin wax adhesive and ball milling according to the ball material ratio of 1:1, the ball milling agent is n-hexane, the ball milling time is 40 hours, the speed is 300 rpm, vacuum dried and sieved into Mo-Ni-B Metal-ceramic mixed powder;

[0050] Step 1b: Put the Mo-Ni-B metal mixed powder in step 1a into a metal mold, seal and vibrate, press the static pressure of 180Mpa, and hold the pressure for 30 minutes to form a prototype integral Mo-Ni-B metal blank;

[0051] Step 1c: Machining the static pressure formed Mo-Ni-B metal rod blank in step 1b into a thread blank, vacuum sintering the Mo-Ni-B metal thread blank, the sintering temperature is 1160°C, the heat preservation and sintering time is 30 minutes, vacu...

Embodiment 2

[0054] Step 2a: 59.0% molybdenum boride alloy powder, 1.0% nickel boride alloy powder, 19.0% nickel-chromium alloy powder, 0.1% Mo powder, 2.5% Cr by mass percentage 2 C 3 Mix with the remaining amount of nickel powder, add paraffin wax adhesive of 3.5% of the total mass of the above-mentioned raw materials, and then ball mill and mix according to the ball material ratio of 1:2. The ball milling agent is kerosene, the ball milling time is 60 hours, and the speed is 280 rpm. Vacuum drying and sieving into Mo-Ni-B metal mixed powder;

[0055] Step 2b: Put the Mo-Ni-B metal mixed powder in step 2a into a metal mold, place a steel rod core in the middle, vibrate and seal it, and form a steel core Mo-Ni through static pressure of 150Mpa and holding pressure for 20 minutes -B metal blank;

[0056] Step 2c: Machining the static pressure formed steel core Mo-Ni-B metal blank in step 2b into a thread blank, vacuum sintering the Mo-Ni-B metal thread blank, the sintering temperature is...

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Abstract

The invention discloses a preparation method of a MoNiB metal ceramic thread element. The preparation method comprises the following steps that Mo-Ni-B metal mixed powder is prepared; a steel tubular core rod is machined; a metal mold is prepared; the steel tubular core rod is placed in the mold, and the space among a outer mold, a core mold and a lower mold is filled with the Mo-Ni-B metal mixed powder; the metal mold filled with the powder is placed into a pressure chamber of press equipment, static pressure molding is performed, and demolding is performed to form a composite molding body with the steel core hollow round rod inside and the Mo-Ni-B metal mixed powder on the outer layer; the composite forming body is machined into a thread element blank; the blank is subjected to vacuum sintering, and a finished blank is obtained; and the finished blank is subjected to finish machining, and the steel-based MoNiB composite metal ceramic product thread element finished product is obtained. The MoNiB metal ceramic thread element has ultrahigh corrosion resistance and wear resistance at the same time.

Description

technical field [0001] The invention belongs to the field of processing, manufacturing and application of metal-ceramic screw composite materials, and specifically relates to the manufacturing technology of metal-ceramic composite screw and MoNiB ceramic material, mainly including cold isostatic pressing and vacuum sintering, and is applied to high-corrosion and high-wear halogen-free Mixing and extrusion molding of fiber-reinforced plastics, etc. Background technique [0002] The extruder screw generally consists of a mandrel with a spline and a threaded element. In actual use, the mandrel drives power, and the threaded element completes the functions of mixing, stirring and extruding plastics. With the increasing requirements of plastics for flame retardancy and high strength, the emergence of halogen-free plastics, fiber-reinforced plastics, and metal powder-reinforced plastics, the corrosion and wear of threaded components are gradually intensified. Traditional nitrided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/04B22F3/10B22F3/24C22C1/05C22C29/14
CPCB22F5/00B22F3/04B22F3/1007B22F3/24C22C29/14C22C29/005C22C1/051B22F2003/247B22F2999/00
Inventor 沈承金朱浩淳陈正王延庆吉喆
Owner CHINA UNIV OF MINING & TECH
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