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Preparation process of WCoB-based metal ceramic

A preparation process and base metal technology, applied in the field of cermet preparation, can solve the problems of increased preparation cycle, high price, increased preparation cycle, etc., and achieve the effects of low cost, simple preparation process and good mechanical performance indicators

Inactive Publication Date: 2015-03-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, the raw materials required by this method are three kinds of components. Obviously, there are strict requirements on the mixing uniformity of the powder. Otherwise, the components cannot be diffused uniformly during the sintering process, so that qualified WCoB-based cermet materials cannot be obtained. Also the prices of the three raw materials used are all high, which will significantly increase the preparation cost
Secondly, this method requires two stages of ball milling, which obviously increases the preparation cycle, which is not conducive to the promotion and use of large-scale industrialization.
Third, this method needs to add a process control agent and also needs granulation treatment, which will also increase the preparation cycle

Method used

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  • Preparation process of WCoB-based metal ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, the raw material selection Co 3 B powder (purity and particle size: 99% and 200 μm) and W powder (purity and particle size: 99% and 200 μm), the weight ratio is controlled at 0.4:0.6, and the process control of adding 10% of the total weight of the mixed powder Anhydrous ethanol, weighed and packed into a stainless steel ball mill jar and vacuumized (vacuum degree is 10 -1 Pa) and filled with argon.

[0017] Then, put the ball mill jar into the ball mill and turn it on, after ball milling for 15 hours, cool down to room temperature together with the jar body, open the jar body and put Co 3 The mixture of B powder and W powder is filled into a metal mold (without drying), and molded under 200MPa.

[0018] Finally, will bloom Co 3 The graphite molds of the molded body of B powder and W powder are put into the vacuum plasma activation sintering furnace together for sintering, and the vacuum degree is 10 during sintering. -1 Pa; the heating rate of the sintering ...

Embodiment 2

[0020] Technological process is basically the same as embodiment 1, but process parameter is different: Co 3 The particle size of B powder is 100 μm; the particle size of W powder is 50 μm, the weight ratio is controlled at 0.6:0.4, and 30% of the total weight of the mixed powder is added with anhydrous ethanol as a process control agent.

[0021] Ball milling time is 35 hours; molding pressure is 300MPa.

[0022] The sintering heating rate is 5° C. / second; the sintering temperature is 1450° C., and the holding time is 25 minutes. The WCoB-based cermet prepared in this example has a flexural strength of 1670 MPa and a hardness of 92.3 HRA.

Embodiment 3

[0024] Technological process is basically the same as embodiment 1, but process parameter is different: Co 3 The particle size of B powder is 150 μm; the particle size of W powder is 120 μm, the weight ratio is controlled at 0.5:0.5, and 25% of the total weight of the mixed powder is added to the process control agent anhydrous ethanol.

[0025] Ball milling time is 20 hours; molding pressure is 220MPa.

[0026] The sintering heating rate is 7° C. / second; the sintering temperature is 1250° C., and the holding time is 15 minutes. The WCoB-based cermet prepared in this example has a flexural strength of 1430 MPa and a hardness of 91.0 HRA.

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Abstract

The invention discloses a preparation process of a WCoB-based metal ceramic. The preparation process comprises the following steps: firstly, selecting raw materials Co3B powder and W powder in a weight ratio of (0.4-0.6): (0.6-0.4); controlling the dosage in the adding process, filling into a ball milling tank after weighing and vacuumizing and filling argon; ball-milling for 15-35 hours and directly filling a mixture of Co3B powder and W powder into a metal die for compression molding; and finally, sintering a compression molding blank in a vacuum plasma activation sintering furnace, wherein the sintering temperature is 1100-1450 DEG C, preserving heat for 10-25 minutes and cooling along with the furnace to obtain the WCoB-based metal ceramic. The preparation process disclosed by the invention is simple and low in cost; the prepared WCoB-based metal ceramic can be suitable for severe conditions such as abrasion, high temperature corrosion and the like.

Description

technical field [0001] The invention relates to a preparation technology of cermets, in particular to a preparation method of cermets composed of a hard phase (about 60%-80% by volume) and a binding phase. Background technique [0002] At present, the widely used WC-Co cermet (also known as cemented carbide), when the temperature reaches 800 ° C, its mechanical properties drop sharply, so that the hardness of the material drops rapidly, so in the working environment with a temperature higher than 800 ° C , WC-Co cermet materials cannot be used. On the other hand, because WC-Co uses a large amount of precious metal W to make it expensive, the cost of the prepared product is relatively high. Researchers or producers at home and abroad are trying to find a new type of cermet that is not only suitable for high-temperature wear environment conditions, but also has low-cost advantages. [0003] WCoB-based cermets (composed of hard phase WCoB and binder phase Co) not only have exc...

Claims

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Application Information

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IPC IPC(8): C22C29/14C22C1/05
CPCC22C1/051C22C29/14
Inventor 皇志富张磊邢建东高义民
Owner XI AN JIAOTONG UNIV