Hard alloy and preparation method thereof

A cemented carbide and alloy technology, applied in the field of cemented carbide, can solve the problems such as the unsatisfactory precipitation of product elements, and achieve the purpose of inhibiting aggregation and recrystallization growth, grain refinement, carburization and/or decarburization defect improvement Effect

Active Publication Date: 2012-11-07
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials are generally only suitable for the production of mechanical seals, friction pairs and other products. The use process only requires the ability to reduce the increased wear of the product due to corrosion, and cannot meet the strict requirements of the elemental precipitation of the product.

Method used

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  • Hard alloy and preparation method thereof
  • Hard alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A corrosion-resistant hard alloy material for drinking water systems and a preparation method thereof, comprising the following steps

[0018] (1) Ingredients and ball milling: Put tungsten carbide powder, -400 mesh nickel powder, -320 mesh chromium powder and -400 mesh chromium carbide powder, grinding aid, and hexane medium according to the proportioning ratio. Ball mill rolling ball milling, ball milling time 36 hours; 2 hours before the end of ball milling, add molten paraffin wax molding agent.

[0019] Proportioning parts by weight are:

[0020] Ball abrasive: 89.8 parts of tungsten carbide powder, 9 parts of nickel powder, 0.96 parts of chromium powder, 0.24 parts of chromium carbide powder;

[0021] Forming agent, grinding aid: 2 parts of paraffin wax forming agent, 0.1 part of stearic acid grinding aid;

[0022] Hexane: Add 320ml of hexane per kilogram of ball mill.

[0023] (2) Drying and granulation: Sieve the ball abrasive through a -300 mesh, dry, and sp...

Embodiment 2

[0031] A corrosion-resistant cemented carbide material for drinking water systems and a preparation method thereof, which are the same as in Example 1 except for the following steps:

[0032] (1) Ingredients and ball milling: Put tungsten carbide powder, -400 mesh nickel powder, -320 mesh chromium powder and -400 mesh chromium carbide powder, grinding aid, and hexane medium according to the proportioning ratio. Ball mill rolling ball milling, ball milling time 48 hours; 2 hours before the end of ball milling, add the paraffin wax forming agent in molten state.

[0033] Proportioning parts by weight are:

[0034] Ball abrasive: 88.5 parts of tungsten carbide powder, 10 parts of nickel powder, 1.2 parts of chromium powder, 0.3 parts of chromium carbide powder;

[0035](4) Sintering: The semi-finished product is dewaxed in a hydrogen carrier gas-low-pressure sintering integrated furnace to remove the molding agent and high-temperature pressure sintering, the sintering temperatur...

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Abstract

The invention discloses a new hard alloy material and a preparation method thereof. The hard alloy is prepared from the following components in percentage by weight: 9.0-10.0% of Ni powder, 0.8-1.2% of Cr powder, 0.2-0.3% of Cr3C2 powder and the balance of WC (wolfram carbide) powder. By adopting the proportional hard alloy mixture and the compound addition mode of Cr and Cr3C2, the carburization and/or decarburization defect of the product can be improved, thereby enhancing the corrosion resistance of the binding phase Ni and the hard phase WC, and refining the alloy grains. The hardness, wear resistance and corrosion resistance of the alloy are enhanced. The hard alloy product prepared by the method disclosed by the invention can satisfy the requirements for long-term water flow erosion endurability and low metallic element precipitation amount.

Description

[0001] technical field [0002] The invention relates to a hard alloy, in particular to a corrosion-resistant hard alloy material for a drinking water system and a preparation method thereof. Background technique [0003] There are many developments for corrosion-resistant hard alloy materials, such as prior art 1: the application date is 1989.12.20, the applicant is: Shanghai University of Technology, the inventor is Sui Yongjiang; Wang Xingqing; He Baoshan; Yu Zhongsun, the patent number is CN89109499.7 , discloses a kind of material that is used to manufacture the friction pair of corrosion-resistant mechanical seals and other wear-resistant and wear-resistant parts. The material is composed of WC-Ni-( Ce+La) is a cemented carbide, which has good corrosion resistance and wear resistance in acidic and alkaline media. Existing technology 2: The application date is 1989.12.20, the applicant is Shanghai Institute of Materials, the inventors are Lin Chunfang; Du Yuguo; Sun Da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 时凯华
Owner ZIGONG CEMENTED CARBIDE CORP
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