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Hard alloy coating matrix added with rare earth

A cemented carbide and rare earth technology, which is applied in the field of rare earth cemented carbide technology, can solve problems such as difficult control, and achieve the effects of decreasing porosity, improving strength and toughness, and improving deformation resistance

Inactive Publication Date: 2012-08-22
CHENGDU BANGPU CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When added in the form of pure rare earths, hydrides, etc., the added rare earths will all become oxides during the drying process of the slurry; although the oxidation degree of the added rare earths can be reduced by using a vacuum drying oven, this process is extremely difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. Add the mass percentage according to the ratio of WC powder: 86.8%; cobalt powder: 6%; TiCN: 3%; tantalum niobium solid solution: 4%; Rolling ball mill (the purity of the raw materials is greater than 99.5%, and the average particle size is less than 3.0 μm), the rotating speed of the ball mill is: 35 rpm, the ball-to-material ratio of the ball mill is: 4:1, the ball mill medium is absolute ethanol, and the liquid-solid ratio 300ml / kg, adding 2.5% molding agent and 0.1% oleic acid of the total mass of raw materials at the same time, the cumulative ball milling time is: 96 hours, the slurry after ball milling to the point is atomized and dried by spray drying, and the drying outlet temperature is: 90°C, drying time: 120 minutes, the bulk density of the obtained spray-dried mixed pellets: 3.5g / cm 3 , the fluidity is: 34 seconds / 50g, the sprayed pellets that meet this requirement are molded by a precision press and sintered in a pressure sintering furnace. The ...

Embodiment 2

[0017] Example 2. Add the mass percentage according to the ratio of WC powder: 81.5%; cobalt powder: 8%; TiCN: 4%; tantalum niobium solid solution: 6%; Rolling ball mill (the purity of the raw materials is greater than 99.5%, and the average particle size is less than 3.0 μm), the rotating speed of the ball mill is: 35 rpm, the ball-to-material ratio of the ball mill is: 4:1, the ball mill medium is absolute ethanol, and the liquid-solid ratio 300ml / kg, adding 2.5% molding agent and 0.1% oleic acid of the total mass of raw materials at the same time, the cumulative ball milling time is: 96 hours, the slurry after ball milling to the point is atomized and dried by spray drying, and the drying outlet temperature is: 90°C, drying time: 120 minutes, the bulk density of the obtained spray-dried mixed pellets: 3.4g / cm 3 , the fluidity is: 36 seconds / 50g, the sprayed pellets that meet this requirement are molded by a precision press and sintered in a pressure sintering furnace. The ...

Embodiment 3

[0020] Example 3, the mass percentage according to WC powder: 85.5%; cobalt powder: 6%; TiCN: 3%; tantalum niobium solid solution: 5%; Rolling ball mill (the purity of the raw materials is greater than 99.5%, and the average particle size is less than 3.0 μm), the rotating speed of the ball mill is: 35 rpm, the ball-to-material ratio of the ball mill is: 4:1, the ball mill medium is absolute ethanol, and the liquid-solid ratio 300ml / kg, adding 2.5% molding agent and 0.1% oleic acid of the total mass of raw materials at the same time, the cumulative ball milling time is: 96 hours, the slurry after ball milling to the point is atomized and dried by spray drying, and the drying outlet temperature is: 90°C, drying time: 120 minutes, the bulk density of the obtained spray-dried mixed pellets is: 3.3g / cm3, fluidity: 36 seconds / 50g, and the spray pellets that meet this requirement are molded in a precision press Sintering is carried out in a pressure sintering furnace. The sintering ...

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Abstract

The invention provides a hard alloy coating matrix added with rare earth and relates to the technical field of rare earth hard alloy processes. The hard alloy coating matrix is prepared through the following steps: proportioning the components of 81-86.8% of WC (Wolfram Carbide) powder, 6-8% of cobalt powder, 3-4% of TiCN, 4-6% of tantalum-niobium solid solution (TaC:NbC=6:4) and 0.2-1% of the rear earth, and then adding the components into a rolling ball mill by using a hard alloy as a grinding body; meanwhile, adding a molding regent which is 4.0-4.5% of a total mass of raw materials and a surfactant which is 0.5-1.0% of the total mass of the raw materials, wherein the accumulated ball-milling time is 72-120 hours; atomizing and drying ball-milled slurry through spray drying; and sintering atomized granules which meet requirements and are formed in a pressure sintering furnace through a precise press. The hard alloy coating matrix is added in a state of rear earth-cobalt intermediate alloy powder, so that not only can the rear earth be ensured to achieve dispersible uniformity in a hard alloy, but also the rear earth can be effectively prevented from being oxidized. The purposes of purifying an interface with the rear earth and strengthening the alloy can be achieved.

Description

Technical field: [0001] The invention relates to the technical field of rare earth hard alloy technology, in particular to a rare earth-added hard alloy coating substrate. Background technique: [0002] The dispersion of rare earth in cemented carbide and the oxidation of rare earth in the drying process of cemented carbide mixture are common problems encountered by workers engaged in the research of rare earth cemented carbide, and it is also the cause of unstable performance of rare earth cemented carbide. main reason. Added in the form of oxides, the rare earths are already very stable, and it is difficult for other reactions to occur. The effect of purifying the interface is basically small or non-existent, and there is no solid solution strengthening of rare earths, because rare earth oxides are basically insoluble in Co, And if the particle size of the added rare earth oxide is large, it will not be able to hinder the phase transition from α-Co to β-Co, because the la...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
Inventor 李克林刘风光
Owner CHENGDU BANGPU CUTTING TOOLS CO LTD
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