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Method of making cemented carbide products

A cemented carbide and cermet technology, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as mold wear, mold filling, demoulding, etc.

Inactive Publication Date: 2013-09-04
SECO TOOLS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the case of high viscosities, problems with mold filling, long-term mold wear, possible opening of weld lines during sintering, formation of cracks and surface defects, and mold release can occur

Method used

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  • Method of making cemented carbide products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (comparison)

[0032] Co powder (OMG ultrafine, granulated with 2% PEG), 38.66 g Cr 3 C 2 (HC Starck), 5161g WC (HC Starck DS80), 20.44g W metal powder, 16g Fischer-Tropsch wax (Sasol H1) and 22g stearic acid were wet milled for 40h to obtain WC-13wt% Co submicron cemented carbide powder . When spray drying the slurry, stearic acid is added at this stage of the process as a granulating agent. The resulting slurry is spray dried to a granular powder.

Embodiment 2

[0033] Embodiment 2 (the present invention)

[0034] 780 g of wax-granulated Co powder (OMG ultrafine, granulated with 1.5% paraffin wax), 38.66 g of Cr 3 C 2 (HC Starck), 5161g WC (HC Starck DS80), 20.44g W metal powder, 16g Fischer-Tropsch wax (Sasol H1) and 22g stearic acid were wet milled for 40h to obtain WC-13wt% Co submicron cemented carbide powder . When spray drying the slurry, stearic acid is added at this stage of the process as a granulating agent. The resulting slurry is spray dried to a granular powder.

Embodiment 3

[0035] Embodiment 3 (comparison)

[0036] By mixing 2500 g of powder from Example 1 with 50.97 g of a Mooney viscosity of 16 ml at 121° C. according to ASTM D-1646 in a Z-blade kneader mixer (Werner & Pfleiderer LUK 1.0) (Engage 8440 , Dow Plastics) and 45.87 g of paraffin wax (Sasol Wax) and 5.06 g of petrolatum (Merkur VARA AB) were kneaded to mix the powder prepared in Example 1. This produced a billet with a density of 8.23 ​​g / ml, corresponding to a φ of 0.553.

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Abstract

A method for the production of tungsten carbide based cemented carbide or cermet tools or components using the powder injection moulding method includes mixing of hard constituent powder and a metallic binder powder with an organic binder system, consisting of 30-60 wt-% olefinic polymers and 40-70 wt-% nonpolar waxes, acting as a carrier for the powder. A metallic binder powder that is granulated with a nonpolar wax is used.

Description

technical field [0001] The invention relates to a method for preparing tungsten carbide-based hard alloy tools or parts by powder injection molding. Background technique [0002] Cemented carbide based on tungsten carbide is a composite consisting of fine grains (μm order) of at least one hard phase in a binder phase. These materials typically comprise the hard phase tungsten carbide (WC). Additionally, other metal carbides of the general composition (Ti, Nb, Ta, W)C, and metal carbonitrides such as Ti(C,N) may also be included. The binder phase typically consists of cobalt (Co). Other binder phase compositions such as Co, Ni and Fe or combinations of Ni and Fe may also be used. [0003] The handling of fine metal powders for the production of cemented carbides and cermets is problematic in two aspects. Since fine-grained powders have a large specific surface area, they tend to react with oxygen in the air. Metal powder oxidation is an exothermic reaction. Also, the ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C1/05C22C29/00B22F1/10B22F1/103B22F1/148C22C1/051
CPCC22C29/08C08K3/00B22F2001/0066B22F3/225B22F1/0059C08K3/10C22C1/05B22F2998/10B22F2999/00B22F1/103B22F1/148B22F1/10B22F1/00B22F9/04B22F2009/042C22C1/051C22C29/005B22F3/1021
Inventor 马蒂亚斯·佩德佩尔·强森
Owner SECO TOOLS AB
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