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Preparation method of steel-based MoNiB metal ceramic screw

A cermet and screw technology, applied in the application field, can solve the problems of ternary boride coatings being brittle, hard, durable, and uneconomical, and achieve the effects of good interface compatibility, uniform distribution, and high bending strength

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

AI Technical Summary

Problems solved by technology

[0004] However, the ternary boride coating is brittle and hard, and the slurry coating on the surface of the steel base has certain limitations. It is neither economical nor durable to use as a whole material

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0030] A kind of preparation method of steel base MoNiB cermet screw rod of the present invention comprises the following steps:

[0031] Step 1: Use nickel powder, molybdenum boride alloy powder, nickel boride alloy powder, and nickel-chromium alloy powder as raw materials, and add a binder for ball milling, and then dry and sieve to obtain Mo-Ni-B metal mixed powder;

[0032] Wherein, according to the mass percentage, the content of each raw material is: 50-70% of molybdenum boride alloy powder, 0.1-2.0% of nickel boride alloy powder, 0.1-37.5% of nickel-chromium alloy powder and the rest of nickel powder; Add an adhesive of 1-5% of the total mass of the above-mentioned raw materials, and the adhesive is paraffin or polyvinyl alcohol;

[0033] 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, or kerosene. The ball milling method is wet planetary ball milling or stirring ball ...

Embodiment 1

[0044] Step 1a: Mix 57% molybdenum boride alloy powder, 1.0% nickel boride alloy powder, 37.0% nickel-chromium alloy powder and the rest of nickel powder according to mass percentage, and add 2.5% of the total mass of the above-mentioned raw materials as a paraffin adhesive, Carry out ball milling and mixing according to the ratio of ball material of 1:1 again, the ball milling agent is n-hexane, the ball milling time is 40 hours, the rotating speed is 300 rpm, vacuum dried and sieved into MoNiB cermet mixed powder;

[0045] Step 1b: Put the mixed powder in step 1a into a polyurethane cylinder mold, place a steel rod core in the middle, use rubber stoppers at both ends to position, exhaust and seal, then dry cold isostatic pressing with a pressure of 170Mpa and keep the pressure for 30 minutes Formed into a steel core MoNiB cermet rod blank;

[0046] Step 1c: Vacuum sintering the MoNiB cermet rod blank formed by cold isostatic pressing in step 1b, the sintering temperature is ...

Embodiment 2

[0049] Step 2a: Mix with 53% molybdenum boride alloy powder, 0.5% nickel boride alloy powder, 7.5% nickel-chromium alloy powder and the rest of nickel powder according to mass percentage, and add 3.5% paraffin wax binder of the total mass of the above raw materials , then carry out ball milling and mixing according to the ball-to-material ratio of 1:2, the ball milling agent is kerosene, the ball milling time is 60 hours, and the rotating speed is 280 revolutions per minute, and is vacuum-dried and sieved into MoNiB cermet mixed powder;

[0050] Step 2b: Put the mixed powder in step 2a into a rubber cylinder mold, place a steel rod core in the middle, use rubber stoppers at both ends to position, exhaust and seal, and then press through cold isostatic pressure of 280Mpa and keep the pressure for 20 minutes to form Steel core MoNiB cermet rod blank;

[0051] Step 2c: Carry out vacuum sintering on the cold isostatic pressing formed steel core MoNiB cermet rod blank of step 2b, t...

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Abstract

The invention discloses a preparation method of a steel-based MoNiB metal ceramic screw. The preparation method of the steel-based MoNiB metal ceramic screw comprises the following steps: Mo-Ni-B metal mixed powder is prepared; a steel core rod is machined, and placed in a cylindrical mold; the Mo-Ni-B metal powder is filled in a mold cavity formed among the steel core rod, the cylindrical mold and an end cover, isostatic cool pressing forming is carried out, and a steel-based Mo-Ni-B metal screw blank is obtained; the steel-based Mo-Ni-B metal screw blank is machined into a screw blank; the screw blank is subjected to vacuum sintering, and a steel-based MoNiB composite metal ceramic screw wrought blank is obtained; and the steel-based MoNiB composite metal ceramic screw wrought blank is subjected to finish machining, and a finished MoNiB composite metal ceramic screw product is obtained. The steel-based MoNiB metal ceramic screw prepared through the preparation method has ultrahigh corrosion resistance and abrasion resistance at the same time, and has excellent comprehensive performance.

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 MoNiB metal-ceramic powder making, cold isostatic pressing, vacuum sintering or hot isostatic pressing Molding, used in compounding, extrusion molding and injection molding of ultra-high corrosion and high wear-resistant halogen-free reinforced plastics, transparent plastics, etc. Background technique [0002] The mixing, extrusion, and injection molding screws of halogen-free plastics, fiber-reinforced plastics, metal powder-reinforced plastics and transparent plastics require ultra-high corrosion resistance and super wear resistance. Traditional nitriding screws, high-speed steel screws, powdered stainless steel screws, carbide-coated screws, etc. can only partially meet the requirements or canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F9/04B22F3/04B22F3/10B22F3/24C22C29/14
CPCB22F5/00B22F9/04B22F3/04B22F3/24B22F3/1007C22C29/14C22C29/005B22F3/1039B22F2009/043B22F2003/248B22F2003/247
Inventor 沈承金周静茹张平陈正吉喆
Owner CHINA UNIV OF MINING & TECH
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