Multiple-boride-based superhard bimetal screw and preparation method thereof

A technology of boride and bimetal, which is applied in the field of multi-component boride-based superhard bimetal screw and its preparation, achieves the effects of simple and easy control of the process, high fracture toughness and extended service life

Inactive Publication Date: 2016-12-14
郴州市泰益表面涂层技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practical application of this material system still needs experimental research, and it has not yet been practically applied in the industrial field.

Method used

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  • Multiple-boride-based superhard bimetal screw and preparation method thereof
  • Multiple-boride-based superhard bimetal screw and preparation method thereof
  • Multiple-boride-based superhard bimetal screw and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, 40Cr steel is used as a mandrel, and a layer of Mo is coated on the surface of the mandrel by hot isostatic pressing sintering. 2 FeB 2 The base cermet layer, and then the screw is made by finishing. The raw material powders used in the preparation of cermets are pure Mo powder (5-10 μm), pure Cr powder (5-10 μm), pure Ni powder (5-10 μm), pure Fe powder (10-15 μm) and FeB powder (20-10 μm). 30 μm), the mixing ratio is 35% FeB, 45% Mo, 3% Ni, 2% Cr, 15% Fe. The concrete preparation method of this bimetallic screw rod is as follows:

[0043] 1. Put the mandrel into a special sheath, and fill the gap between the mandrel and the sheath with the mixed raw material powder;

[0044] 2. Put the package as a whole into the sealed container of the hot isostatic pressing equipment and vacuumize;

[0045] 3. The cermet green body is prepared by hot isostatic pressing sintering method, and argon is used as the pressurized medium. The process parameters of ho...

Embodiment 2

[0052] The preparation of the screw in this example is basically the same as in Example 1, the difference is that the mixing ratio of the raw material powder is changed to: 30% FeB, 50% Mo, 3% Ni, 2% Cr, 15% Fe, other experimental conditions same. The microhardness test was carried out on the cermet of the bimetallic screw prepared above, and the average hardness was 1137.5Hv (HRC73).

Embodiment 3

[0054] The preparation of the screw in this example is basically the same as in Example 1, the difference is that the mixing ratio of the raw material powder is changed to: 30% FeB, 45% Mo, 3% Ni, 2% Cr, 20% Fe, other experimental conditions same. The microhardness test was carried out on the cermet of the bimetallic screw prepared above, and the average hardness was 1110.1Hv (HRC72.4).

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Abstract

The invention discloses a multiple-boride-based superhard bimetal screw and a preparation method thereof. According to the bimetal screw, an alloy structure steel bar containing chromium and molybdenum serves as a mandrel, the surface of the mandrel is wrapped by a multiple-boride-based metal ceramic layer, and then the finished screw is prepared through finish machining. Multiple-boride-based metal ceramic is high in fracture toughness and good in machinability, the thermal expansion coefficient of the screw is similar to that of steel, the screw can be well combined with the chromium-molybdenum alloy structure steel, friction abrasion performance, high temperature resistance and corrosion resistance are excellent, use performance of the screw can be greatly improved, and the service life of the screw is prolonged. Compared with a screw which is widely used at present and subjected to nitriding, spray welding and the like, the bimetal screw has good application prospects and economic benefits.

Description

technical field [0001] The invention relates to the technical field of screw manufacturing, in particular to a multi-component boride-based superhard bimetallic screw and a preparation method thereof. Background technique [0002] The screw and barrel are the core components of plastic molding equipment, and they are the parts that are heated, extruded and plasticized. Compared with the barrel, the screw is more prone to failure and damage due to friction and wear. With the rapid development of the chemical industry, various new plastic raw materials are emerging. In high-strength reinforced plastic raw materials, such as carbon, asbestos, glass, boron and other reinforcing fibers are often contained. In addition, in order to obtain various special properties or reduce costs, a certain proportion of various fillers, such as chalk, silica, barite, clay, cellulose, mica, talc and metal powder, are often added to plastic resins. Due to the addition of these reinforcing agents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/14C22C1/05B22F3/15B22F7/08
CPCC22C29/14B22F3/15B22F7/08C22C1/058C22C29/005
Inventor 袁建辉单张飞
Owner 郴州市泰益表面涂层技术有限公司
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