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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
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  • 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 or the holding time is too long, which is easy to cause The uneven distribution of the Co phase or the appearance of holes or carbon-deficient phases during overheating and over-burning seriously affect the mechanical properties of the alloy.

Method used

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  • 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

Embodiment 1

[0028] Example 1: The goal is to prepare WC-15wt.%Co cemented carbide bulk material. Mix the tungsten carbide powder passed through a 500-mesh sieve with a mixed solution of PEG and diffusion oil at a volume ratio of 9:1. Each 100g of WC powder corresponds to 10ml of the mixed solution. After drying for 30 minutes, under a pressure of 300MPa (keep 10s) Carrying out cold pressing, covering and compacting the upper and lower surfaces of the cold-pressed compact with Co powder, placing it in a crucible, and putting it into a low-pressure sintering furnace for sintering. Raise the temperature from room temperature to 200°C at a rate of 4°C / min, keep it warm for 30 minutes, and discharge the gas adsorbed in the powder; continue to raise the temperature to 450°C, feed hydrogen, and keep it warm for 30 minutes to ensure that PEG and diffusion oil are completely discharged; continue to rise to 800°C in turn ℃ and 1230℃ respectively for 30 minutes to ensure that the temperature distrib...

Embodiment 2

[0029] Example 2: The goal is to prepare WC-10wt.%Co cemented carbide bulk material. Mix the tungsten carbide powder passed through a 500-mesh sieve with a mixture of prepared PEG and diffusion oil at a ratio of 9:1, dry for 30 minutes, and perform cold pressing under a pressure of 300 MPa (holding for 10 seconds). The billet is pre-sintered in a low-pressure sintering system. The specific process is: raise the temperature from room temperature to 270°C at a rate of 4°C / min, and keep it for 40 minutes; The speed was increased to 1450°C for 30 minutes, and the furnace was cooled to room temperature to prepare porous tungsten carbide; after the upper and lower surfaces of porous tungsten carbide were covered with Co powder and compacted, they were placed in a crucible and sintered in a low-pressure sintering furnace. The process is as follows: heat up from room temperature to 1230°C at a rate of 4°C / min, pass in hydrogen and keep warm for 60 minutes; heat up to 1480°C at a rate ...

Embodiment 3

[0030]Example 3: The goal is to prepare WC-8wt.%Co cemented carbide bulk material. Mix the tungsten carbide powder passed through a 800-mesh sieve with a mixture of prepared PEG and diffusion oil at a ratio of 10:1, dry for 30 minutes, and perform cold pressing under a pressure of 350 MPa (holding for 10 seconds). The billet is pre-sintered in a low-pressure sintering system. The specific process is: raise the temperature from room temperature to 250°C at a rate of 4°C / min, and keep it for 30 minutes; The speed was increased to 1500°C for 30 minutes, and then cooled to room temperature with the furnace to prepare porous tungsten carbide; after the upper and lower surfaces of porous tungsten carbide were covered with Co powder and compacted, they were placed in a crucible and sintered in a low-pressure sintering furnace. The specific process is as follows: heat up from room temperature to 1250°C at a rate of 4°C / min, pass in hydrogen, and keep warm for 40 minutes; heat up to 15...

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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

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Application Information

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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
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