Preparation method of WC-Co hard alloy with average grain size larger than 15 microns

An average grain size, hard alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of lack of carbon phase, high sintering temperature, short ball milling time, etc., to promote the increase of fluidity and pore distribution Uniform, uniform temperature distribution effect

Active Publication Date: 2019-10-22
BEIJING UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above preparation method has the following problems: (1) only by adjusting the cemented carbide preparation process, the WC grain size grows limited; (2) the ball milling time is too short, the sintering temperature is too high o

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
  • Preparation method of WC-Co hard alloy with average grain size larger than 15 microns
  • Preparation method of WC-Co hard alloy with average grain size larger than 15 microns
  • Preparation method of WC-Co hard alloy with average grain size larger than 15 microns

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1: The goal is to prepare WC-15wt.%Co cemented carbide bulk material. The tungsten carbide powder that has passed through a 500 mesh sieve is mixed with a mixture of PEG and diffusion oil in a volume ratio of 9:1. Each 100g of WC powder corresponds to 10ml of the mixture. After drying for 30 minutes, under a pressure of 300MPa (maintain 10s) Perform cold pressing. After coating and compacting the upper and lower surfaces of the cold pressed compacts with Co powder, they are placed in a crucible and placed in a low pressure sintering furnace for sintering. Increase the temperature from room temperature to 200°C at a rate of 4°C / min, hold for 30 minutes, and discharge the gas adsorbed in the powder; continue to heat to 450°C, pass in hydrogen, and hold for 30 minutes to ensure that PEG and diffusion oil are completely discharged; continue to increase to 800 ℃ and 1230℃ were kept for 30min respectively to ensure the uniform temperature distribution of the alloy; the...

Example Embodiment

[0029] Example 2: The goal is to prepare WC-10wt.%Co cemented carbide bulk material. The tungsten carbide powder that has passed through a 500-mesh sieve is mixed with a 9:1 mixture of PEG and diffusion oil. After drying for 30 minutes, it is cold pressed under a pressure of 300 MPa (maintained for 10 seconds). The billet is placed in a low-pressure sintering system for pre-sintering. The specific process is: rise from room temperature to 270°C at a rate of 4°C / min, and hold for 40 minutes; continue to heat up to 450°C, pass in hydrogen, and hold for 60 minutes; use the same temperature rise The rate is increased to 1450°C for 30 minutes, and the furnace is cooled to room temperature to prepare porous tungsten carbide; after coating and compacting the upper and lower surfaces of the porous tungsten carbide, Co powder is placed in a crucible for sintering in a low pressure sintering furnace. The process is as follows: heating from room temperature to 1230°C at a rate of 4°C / min,...

Example Embodiment

[0030] Example 3: The goal is to prepare WC-8wt.%Co cemented carbide bulk material. The tungsten carbide powder that has passed through the 800-mesh sieve is mixed with a 10:1 mixture of PEG and diffusion oil. After drying for 30 minutes, it is cold pressed under a pressure of 350 MPa (maintained for 10 seconds). The billet is placed in a low-pressure sintering system for pre-sintering. The specific process is: rise from room temperature to 250°C at a rate of 4°C / min, and hold for 30 minutes; continue to heat up to 500°C, pass in hydrogen, and hold for 60 minutes; use the same temperature rise The rate was increased to 1500°C for 30 minutes, and the furnace was cooled to room temperature to prepare porous tungsten carbide; after coating and compacting Co powder on the upper and lower surfaces of the porous tungsten carbide, it was placed in a crucible and sintered in a low-pressure sintering furnace. The specific process is as follows: heating from room temperature to 1250°C at...

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

No PUM Login to view more

Abstract

The invention discloses a preparation method of a WC-Co hard alloy with an average grain size larger than 15 microns, and belongs to the field of block material preparation. The preparation method comprises the steps of taking coarse-particle WC powder as raw material, sieving and grading, stirring and mixing the sieved and graded raw material with a mixed solution formed by PEG and diffusion oilin a certain proportion, and drying and pressing to prepare a WC cold-pressed green body; directly coating the cold-pressed green body with Co powder in different masses, compacting, sintering and cooling in a low-pressure sintering furnace to obtain a WC-Co hard alloy material with WC grain size larger than 15 microns; or sintering the cold-pressed green body to prepare porous carbide; and then coating the porous carbide with the Co powder in different masses and compacting, and sintering at low pressure to prepare the hard alloy material with WC grain size larger than 15 microns and different Co content.

Description

technical field [0001] The invention belongs to the field of bulk material preparation, and in particular relates to a method for preparing cemented carbide with an average grain size greater than 15 μm. [0002] technical background [0003] WC-Co cemented carbide is a composite material composed of a brittle WC phase and a Co binder phase. It is widely used in cutting processing and mining because of its excellent properties such as high hardness, high wear resistance, good fracture strength and impact toughness. The use of wear-resistant parts in mining, tunneling, etc. With the increase of the mining depth of minerals and petroleum, higher requirements are put forward for the toughness of cemented carbide materials for making wear-resistant tools and molds, and increasing the grain size of WC is one of the important methods to improve the toughness of alloys. At present, researchers prepare cemented carbide with large grain size by improving the cemented carbide preparat...

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): C22C29/08C22C1/05B22F1/00B22F3/16
CPCC22C29/08C22C29/067C22C1/051B22F3/16B22F2998/10B22F2999/00B22F1/102B22F1/103B22F1/14B22F3/1007B22F2201/013B22F2201/11B22F3/02B22F3/1017
Inventor 刘雪梅冯浩宋晓艳侯超吕皓王海滨
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap