Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for preparing beta layer removing gradient hard alloy

A kind of cemented carbide and preparation process technology, applied in the field of preparation of de-beta layer gradient cemented carbide

Inactive Publication Date: 2011-04-27
UNIV OF SCI & TECH BEIJING +2
View PDF2 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, although the one-step sintering method and the two-step sintering method can be used to prepare β-degraded cemented carbide, both methods have certain limitations.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for preparing beta layer removing gradient hard alloy
  • Process for preparing beta layer removing gradient hard alloy
  • Process for preparing beta layer removing gradient hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh several raw material powders, and their composition ratio is (mass fraction): WC, 80.1%, (Ti, W) C, 8%, Co, 10%, carbon black, 0.3%, Ti(C, N) , 1.6%, wherein the average Fibonacci particle size of Ti (C, N) powder is 2.0 micron, C, N atomic ratio is 0.5: 0.5; After mixing raw material powder, pack into stainless steel ball mill barrel and carry out wet milling, in ball mill barrel There are cemented carbide balls with 8mm diameter, the ball-to-material ratio is 4: 1, the ball milling medium is alcohol, and the ball milling time is 36 hours; the slurry after the ball milling is carried out vacuum drying, after drying, add 2wt% paraffin gasoline solution, again After drying, crushing and sieving, the mixed material is obtained; the sample compact is molded by a press at a pressure of 200 MPa, and then vacuum sintered at a temperature of 1420°C. After 2 hours of heat preservation, the furnace cools to obtain a beta-layer gradient cemented carbide For the sample, the ...

Embodiment 2

[0022] The C of the selected Ti (C, N) powder, the atomic ratio of N is 0.7: 0.3, and the average Fischer particle size is 2.0 microns, and the composition ratio and preparation process of other raw materials are all the same as in Example 1, and finally obtained de-beta The thickness of the layer is 26 microns, and the bending strength of the substrate is 1743N / mm 2 .

Embodiment 3

[0024] The composition ratio of the raw material powder is (mass fraction): WC, 82.1%, (Ti, W) C, 8%, Co, 8%, carbon black, 0.3%, Ti (C, N), 1.6%, of which Ti The average Fischer particle size of the (C, N) powder is 2.0 microns, and the atomic ratio of C and N is 0.5:0.5; the mixture is prepared in the form of spray granulation. Finally, the thickness of the de-beta layer is 45 microns, and the bending strength of the substrate is 1872N / mm 2 .

[0025] The preparation process is the same as that of Example 1, but the examples using other alloy initial components and gradient sintering process are shown in the table below.

[0026]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Average fischer particle sizeaaaaaaaaaa
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a process for preparing a beta layer removing gradient hard alloy. The gradient hard alloy is generally used as a matrix of coating hard alloy. The preparation process comprises the following steps of: adding merchant granular Ti(C,N) powder into titanium-containing hard alloy raw materials; meanwhile, in order to improve the activity of nitrogen in the hard alloy matrix so that the surface layer of the hard alloy matrix is easier for denitrification, adding a certain amount of carbon black so that the hard alloy matrix forms a high-carbon component; and preparing a cutter or a sample pressing blank by a standard hard alloy manufacturing process, and finally sintering, wherein a one-step sintering method is adopted in the sintering process, namely normal de-waxing and deoxidization processes are adopted for sintering, then vacuum sintering is performed after reaching the gradient sintering temperature, and the beta layer removing gradient hard alloy can be prepared by furnace cooling. The thickness of the beta-removing layer of the prepared gradient hard alloy can reach 10 to 60 microns, and the gradient hard alloy has good compactness and bending strength; and meanwhile, because the merchant medium granular Ti(C,N) powder and the one-step sintering method are adopted, the production process can be reduced, and the production cost can be lowered.

Description

technical field [0001] The invention relates to a preparation process of a beta layer-removed gradient cemented carbide. Background technique [0002] Cemented carbide is a kind of cermet tool material prepared by powder metallurgy with refractory metal carbide as the matrix and transition metal as the binder phase. With its high strength, high hardness, wear resistance, corrosion resistance and other advantages, cemented carbide has been widely used in mining, metal processing and mold industries. The main component of traditional homogeneous cemented carbide is composed of hard phase and binder phase, which leads to two pairs of contradictory properties: hardness and strength, wear resistance and toughness, that is, increasing the hardness and toughness of cemented carbide Wear resistance will reduce its strength and toughness at the same time. In order to improve this situation, in the field of metal processing, the current common practice is to use chemical vapor depos...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C1/05C22C29/08
Inventor 黄继华史留勇吴冲浒张守全刘义敏邹伶俐谢海唯吴其山肖满斗
Owner UNIV OF SCI & TECH BEIJING
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com