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A kind of preparation method of superfine cemented carbide

A cemented carbide and inhibitor technology, which is applied in the field of ultra-fine cemented carbide preparation, can solve problems affecting product quality and difficult to meet strict standards for customer shapes, so as to prevent impurity intrusion, shorten product production cycle, and reduce production cost effect

Active Publication Date: 2018-06-26
河源富马硬质合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The ultra-refinement of grains can improve the mechanical properties of cemented carbide tools such as strength and hardness, but the current process of grain refinement is mainly affected by impurities, and the grains are often based on impurities as the core, thus forming large ones. Grain, and in the process of grain refinement, it will be sintered slowly and continuously, so it is difficult to meet the strict standard for the shape required by the customer or design, which will affect the quality of the product

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  • A kind of preparation method of superfine cemented carbide

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Embodiment 1

[0023] A preparation method of superfine cemented carbide, comprising the following steps:

[0024] S1. Calculation and degumming, first calculate the amount of raw materials according to the composition requirements of ultrafine cemented carbide, then add grain growth inhibitors according to material performance requirements, and preheat all raw materials at low temperature for degumming;

[0025] S2. Pre-firing, put the preheated raw materials into the forming mold, keep the temperature constant, and press molding under 150MPa pressure, then sinter the powder under low pressure at 1420°C-5MPa to densify, anneal at low temperature and cool to room temperature to prepare Obtain the original blank;

[0026] S3, grinding, rough grinding is carried out to the original blank, and the adjacent end faces of the original blank after rough grinding are docked, and fine grinding is carried out during the process of end face docking, so as to achieve direct seamless contact between adja...

Embodiment 2

[0031] A preparation method of superfine cemented carbide, comprising the following steps:

[0032] S1. Calculation and degumming, first calculate the amount of raw materials according to the composition requirements of ultrafine cemented carbide, then add grain growth inhibitors according to material performance requirements, and preheat all raw materials at low temperature for degumming;

[0033] S2. Pre-firing, put the preheated raw materials into the forming mold, keep the temperature constant, and press molding under 150MPa pressure, then sinter the powder under low pressure at 1420°C-5MPa to densify, anneal at low temperature and cool to room temperature to prepare Obtain the original blank;

[0034] S3, grinding, rough grinding is carried out to the original blank, and the adjacent end faces of the original blank after rough grinding are docked, and fine grinding is carried out during the process of end face docking, so as to achieve direct seamless contact between adja...

Embodiment 3

[0039] A preparation method of superfine cemented carbide, comprising the following steps:

[0040] S1. Calculation and degumming, first calculate the amount of raw materials according to the composition requirements of ultrafine cemented carbide, then add grain growth inhibitors according to material performance requirements, and preheat all raw materials at low temperature for degumming;

[0041] S2. Pre-firing, put the preheated raw materials into the forming mold, keep the temperature constant, and press molding under 150MPa pressure, then sinter the powder under low pressure at 1420°C-5MPa to densify, anneal at low temperature and cool to room temperature to prepare Obtain the original blank;

[0042] S3, grinding, rough grinding is carried out to the original blank, and the adjacent end faces of the original blank after rough grinding are docked, and fine grinding is carried out during the process of end face docking, so as to achieve direct seamless contact between adja...

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Abstract

The invention discloses a method for preparing ultrafine cemented carbide, which comprises the following steps: S1, calculation and degumming, calculating the amount of raw materials, and performing low-temperature preheating and degumming; S2, pre-burning, low-pressure sintering and densification, and low-temperature annealing and cooling Prepare the original blank at room temperature; S3, grind, perform rough grinding and fine grinding to obtain the rough blank; S4, sinter, heat up and increase the pressure to sinter the rough blank; S5, anneal and cool out of the furnace, use a grain growth inhibitor to Inhibit the growth of crystal grains, prevent the crystal grains from being cemented into granules with impurities as the core, and the whole process is carried out under vacuum conditions, effectively preventing the intrusion of impurities, and adopting two sintering processes, the control of the design shape is more accurate during the pre-sintering process Accurate and effective to reduce production cost and low production cycle.

Description

technical field [0001] The invention relates to the field of hard alloy preparation, in particular to a preparation method of ultrafine hard alloy. Background technique [0002] Ultrafine cemented carbide (the average grain size after sintering is 0.2-0.5μm) has become one of the hot spots in the research and development of cemented carbide materials at home and abroad because of its unique high hardness and high strength "double high" mechanical properties. It is an important research and development direction of the cemented carbide industry. [0003] The ultra-refinement of grains can improve the mechanical properties of cemented carbide tools such as strength and hardness, but the current process of grain refinement is mainly affected by impurities, and the grains are often based on impurities as the core, thus forming large ones. Grain, and in the process of grain refinement, it will be sintered slowly and continuously, so it is difficult to meet the strict standard fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05
CPCC22C1/051B22F2998/10B22F1/14B22F2003/248B22F3/14B22F2003/166B22F3/02
Inventor 王忠平黄伟郭光富
Owner 河源富马硬质合金股份有限公司