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Fine grained sintered cemented carbides containing a gradient zone

一种硬质合金、粘结相的技术，应用在刀夹的附件、金属加工设备、用于车床的刀具等方向，能够解决不希望负面效果等问题

Inactive Publication Date: 2007-01-10
SANDVIK INTPROP AB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When inhibitors are usually added in the form of carbides, they limit grain growth during sintering, but also have undesired negative effects

Method used

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  • Fine grained sintered cemented carbides containing a gradient zone
  • Fine grained sintered cemented carbides containing a gradient zone
  • Fine grained sintered cemented carbides containing a gradient zone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw materials 1, 2 and 4 given in Table 1 were used to manufacture powders with a composition of 12 wt% Co-8, 1 wt% V and the balance WC. Press and sinter the blade. Use P N2 = 950 mbar and up to T = 1380°C for sintering in order to nitriding the alloy. Sintering was performed under vacuum from a sintering temperature of T=1380°C and up to T=1410°C. The nitrogen content of the sintered insert was 0.35 wt% N.

[0018] Raw material, No.

[0019] The result of the cutting insert containing a 75 μm thick binder-phase-enriched surface region below its clearance face and rake face, which is substantially free of cubic carbide phases, and has a significantly reduced gradient thickness near the edge portion of the surface ,See figure 1 . The grain size of WC is about 0.9 μm.

Embodiment 2

[0021] The same powder as the blade in Example 1 was used for pressing and sintering. Sintering was performed using the same procedure, however maintaining P throughout the sintering cycle N2 = 950 mbar.

[0022] Below the interstitial and rake faces is a structure with a surface region comprising a 50 μm thick gradient binder phase enriched region, with the edge near the surface having a significantly reduced gradient thickness, see figure 2 . The nitrogen content of the sintered insert was 0.35 wt%. Determination of elemental distribution using EPMA (Electron Probe Microanalysis), see image 3 . Note that the surface region is substantially free of V. The grain size of WC is about 0.9 μm.

Embodiment 3

[0024] Raw materials 1, 2, 3, 4 in Table 1 were used to manufacture powders with a composition: 13 wt% Co, 3.47 wt% V, 3.27 wt% Ti and the balance WC.

[0025] Sintering is carried out according to the conditions of Example 1, the surface structure under the gap surface and the rake surface is a 55 μm thick binder phase surface area, and the edge portion near the surface has a significantly reduced gradient thickness, see Figure 4 . The nitrogen content of the sintered insert was 0.45 wt%. The grain size of WC is about 0.9 μm.

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Abstract

The invention relates to a fine-grained cutting tool insert consisting of a cemented carbide base and a coating. A cemented carbide substrate comprising WC, a binder phase and vanadium containing a cubic carbide phase has a binder phase enriched surface region substantially free of the cubic carbide phase.

Description

technical field [0001] The present invention relates to a fine-grained cemented carbide having a binder-phase-enriched surface region, the so-called gradient region. The gradient zone is substantially free of cubic carbides or carbonitrides that may form from the addition of grain growth inhibitors. Moreover, the grains in the gradient region are very fine. Background technique [0002] Today, coated carbide inserts with binder-phase-rich surface regions are widely used in the machining of steel and stainless steel materials. Due to the presence of binder phase enriched surface regions, application extensions to cutting tool materials have been obtained. [0003] The manufacture of cemented carbides containing WC, a cubic phase (carbonitride) and a binder phase with a binder phase enriched surface region belongs to the technique known as gradient sintering and is known from many patents and patent applications . According to US patents 4,277,283 and 4,610,931, nitrogen w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08B23B27/14B23B51/00B23C5/16B23D13/00
CPCY10T428/252Y10T428/24983C22C29/08Y10T428/12056Y10T428/265Y10T428/12028B22F2998/00B22F2207/03C22C1/04C22C29/02
Inventor 诺布姆·格雷塔·哈希·恩齐梅拉约翰内斯·亨诺克·尼蒂林苏珊·诺格伦汉斯-欧洛夫·安德伦亚历山大·库索夫斯基博·扬松
Owner SANDVIK INTPROP AB
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