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Preparation method of superfine cemented carbide tool material

A cemented carbide and tool material technology, which is used in the preparation of cemented carbide materials and the preparation of ultra-fine cemented carbide tool materials, can solve the problems of ultra-fine WC and Co difficulty, WC grain growth, etc., to avoid uniformity. Difficulty in dispersion, avoid brittleness increase, improve the effect of uniform distribution

Active Publication Date: 2021-02-12
SICHUAN UNIV
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Problems solved by technology

[0005] Aiming at the problem that ultra-fine WC and Co are difficult to disperse evenly when preparing ultra-fine cemented carbide, and the WC grains tend to grow abnormally during the sintering process, the present invention proposes to introduce evenly dispersed P element into the ultra-fine WC powder, and then Co-P solid solution is formed on the surface of WC by solid solution treatment, and vacuum sintering is carried out after mixing and pressing by ball milling. Densification achieved at lower sintering temperatures

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  • Preparation method of superfine cemented carbide tool material

Examples

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example 1

[0020] Example 1: Prepare superfine cemented carbide cutter material according to the following steps:

[0021] (1) Introduce P into ultrafine WC powder: weigh cobalt sulfate, sodium hypophosphite (NaH 2 PO 2 ), propionic acid and sodium citrate were added to deionized water to prepare mixed solution A, the formula of mixed solution A was cobalt sulfate 50g / L, sodium hypophosphite (NaH 2 PO 2 ) 66g / L, propionic acid 4g / L, sodium citrate 42g / L, adjust the pH value of the mixture A to 4 to control the introduction of P; take superfine WC powder with a Fibonacci particle size of 0.4μm and oleic acid Mixed solution B is formed in deionized water, wherein the amount of WC added is 29g / L, so that it can keep mixed solution A stable after being added to mixed solution A, the added amount of oleic acid is 16g / L, and its pH value is adjusted to 4 , control its zeta potential to 25mV, and perform ultrasonic dispersion treatment for 30min to keep WC in suspension; mix the mixed soluti...

example 2

[0026] Example 2: Prepare superfine cemented carbide cutter material according to the following steps:

[0027] (1) Introduce P into ultrafine WC powder: weigh cobalt sulfate, sodium hypophosphite (NaH 2 PO 2 ), propionic acid and sodium citrate were added to deionized water to prepare mixed solution A, the formula of mixed solution A was cobalt sulfate 58g / L, sodium hypophosphite (NaH 2 PO 2 ) 70g / L, propionic acid 6g / L, sodium citrate 45g / L, adjust the pH value of the mixture A to 5 to control the introduction of P; take superfine WC powder with a Fibonacci particle size of 0.3μm and oleic acid into the Mixed solution B is formed in deionized water, wherein the amount of WC added is 28g / L, so that it can keep the formed mixed solution C stable after it is added to mixed solution A, and the added amount of oleic acid is 23g / L to adjust its pH value 5, control its zeta potential to 28mV, and carry out ultrasonic dispersion treatment for 30min to keep WC in a suspended state...

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Abstract

The invention discloses a preparation method of ultrafine cemented carbide cutting tool material, which is characterized in that oleic acid is used to disperse ultrafine WC powder, and sodium hypophosphite reduces cobalt sulfate to make P and Co elements in WC particles. Surface deposition, and then pre-solution treatment at 1000~1010°C to make P and Co in WC powder form a Co‑P solid solution, and finally through ball milling, compression molding and vacuum sintering at 1380~1390°C, after sintering, 100~110 The average cooling rate of °C / min is rapidly cooled to below 1000 °C, avoiding Co 2 Precipitation of P brittle phase at the WC / Co interface. The present invention overcomes the problems that the high sintering temperature will lead to abnormal growth of crystal grains when the existing ultra-fine cemented carbide tool material is prepared, and it is difficult to achieve densification when the sintering temperature is low, and can be used for CNC machining cutting tool materials .

Description

technical field [0001] The invention relates to a method for preparing a hard alloy material, in particular to a method for preparing an ultrafine cemented carbide tool material, and belongs to the field of hard materials. Background technique [0002] The grain size of WC in ultrafine cemented carbide is less than 0.5 μm, and it has excellent comprehensive properties of high strength, high hardness, and high toughness. It is widely used in aerospace, energy equipment, electronics industry, wood processing and other industries. CNC cutting tools for precision machining. [0003] CN111378860A discloses a kind of superfine cemented carbide and its preparation method, the grain growth inhibitor that adopts contains Cr 3 C 2 , VC, TiC and or Ti(C,N), the average grain size of the prepared ultrafine cemented carbide is (0.2~0.6) μm, 0.54≤WC grain size dispersion coefficient K≤0.61, the grain size is greater than 3 The percentage of WC grains whose grain size is less than 5 tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 郭智兴荆凯峰熊计华涛游钱炳张洪
Owner SICHUAN UNIV
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