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Cemented carbide sintering method and sintered product under multi-atmosphere control

A technology of cemented carbide and sintering method, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of excessive carburization, difficult gas cracking degree, poor uniformity of solid-phase carburizing method of fillers, etc. , to achieve the effect of simplified processing steps, good product quality and good industrial application prospects

Active Publication Date: 2016-04-20
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain disadvantages. The uniformity of the filler solid phase carburizing method is poor, and the low carbon chain organic gas cracking method is difficult to control the degree of gas cracking at high temperature, and it is prone to excessive carburization.

Method used

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  • Cemented carbide sintering method and sintered product under multi-atmosphere control
  • Cemented carbide sintering method and sintered product under multi-atmosphere control
  • Cemented carbide sintering method and sintered product under multi-atmosphere control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Cemented carbide insert model CNMG120408, containing cubic carbide dopant (1% cubic carbide doping), containing 10% Co, 89%WC (0.8μmWC), first sintered at 1410°C in a traditional way, Cooled to room temperature under the protection of argon, the obtained product surface scanning photos are as follows: figure 1 shown by figure 1 It can be clearly seen that there are many cobalt areas on the surface of the product. The energy spectrum component analysis on the surface of the product is shown in Table 1. The cobalt content on the surface is 61.87%, which is much higher than the cobalt content of 10%, and a bonding phase is formed. thin layer of cobalt.

[0025] Table 1: Energy spectrum composition analysis of products obtained by traditional sintering methods

[0026]

[0027]The above-mentioned blades with the same composition and type are first heated to the eutectic temperature of 1350°C for heat preservation by the sintering method of the present invention, then h...

Embodiment 2

[0030] Carbide insert model SNMN150408, containing dopants (0.5% cubic carbide doping), 6.0% Co, 93.5% WC (1.0 μm WC), sintered at 1450 °C in a conventional manner, under argon protection, Cool to room temperature. The obtained product surface scan photos are as follows: image 3 As shown, it can be clearly seen that there are many cobalt areas on the surface of the product. The energy spectrum composition analysis of the product surface is carried out. The composition is shown in Table 3. The surface cobalt content is 51.4%, which is much higher than the cobalt content of 10%. Binder phase Cobalt thin layer.

[0031] Table 3: Energy spectrum composition analysis of products obtained by traditional sintering methods

[0032]

[0033] Blades of the same composition and type are heated to the eutectic temperature of 1350°C in the present invention, then heated to the sintering temperature of 1450°C, and then cooled to 1200°C. After the eutectic temperature of 1350°C, the pr...

Embodiment 3

[0036] An alloy containing 7.5% Co, 87.5% WC, and 5% dopant (5.0 μm WC, 5% cubic carbide doped), sintered according to the normal process, cooled to room temperature under the protection of argon, the product is carbon-poor, and characterized The performance index of alloy carbon content - cobalt magnetism is below the lower control limit. In order to solve the problem of decarbonization (low) of the product, the controllable atmosphere cemented carbide sintering method of the present invention is used to carburize the cemented carbide product of the above-mentioned embodiment, and the sintered alloy is heated to the eutectic temperature of 1350°C Keep it warm, then heat it to the sintering temperature of 1410°C and keep it warm, and then cool it to 1200°C. After holding the temperature from the eutectic temperature of 1350°C, start to introduce "carbon monoxide + hydrogen" with a pressure of 80mbar and a flow rate of 15slm. The flow rate of carbon monoxide is 5slm, CO :H 2 T...

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Abstract

The invention discloses a cemented carbide sintering method under multi-atmosphere control. The cemented carbide green body or the sintered decarburized or low-carbon cemented carbide is used as the sintering raw material, and the sintering raw material is firstly heated to the eutectic temperature. , then heat preservation, after the heat preservation is completed, the temperature is raised to the sintering temperature, and the heat preservation is carried out at the sintering temperature. In the mixed atmosphere of carbon monoxide and hydrogen, the atmosphere pressure in the mixed atmosphere of carbon monoxide and hydrogen is controlled at 20-800mbar, and the flow rate of carbon monoxide gas is greater than 0.5? slm. The method of the present invention has simple steps, easy operation, low requirements on processing equipment, low cost, and good product quality. Carburizing and flashback of carbonized or decarburized cemented carbide products.

Description

technical field [0001] The invention relates to a cemented carbide sintering method and a sintered product, in particular to a cemented carbide sintering method and a sintered product with a controllable atmosphere. Background technique [0002] Coated carbide inserts have been used in metal cutting for nearly half a century. The matrix of this blade is usually made of refractory metal carbide (usually WC with carbides such as Nb, Ti, Ta) added and metal binder phase Co. Coating TiC, TiN, Al on inserts 2 o 3 Such as single or composite coating wear-resistant materials, which can improve wear resistance without damaging the toughness of the blade. [0003] During the sintering process of cemented carbide inserts, there is usually a thin layer of binder phase less than 1 μm (sometimes up to 2 μm to 3 μm) covering all or part of the surface of the insert. This phenomenon is common on inserts rich in cobalt in the surface area (ie, cobalt gradient inserts), and it also occur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/10B22F3/24C23C8/20
Inventor 张益中谢宏
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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