Non-magnetic metal ceramic mould and preparation method thereof

A metal ceramic and mold technology, applied in the field of metal ceramic materials, can solve the problems of insufficient wear resistance, low performance of non-magnetic hard alloy molds, etc., and achieve the effects of improving strength, good promotion and application prospects, and strong high temperature oxidation resistance.

Active Publication Date: 2010-11-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a non-magnetic cermet mold and its preparation method, which solves the problems of low performance and ins

Method used

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  • Non-magnetic metal ceramic mould and preparation method thereof
  • Non-magnetic metal ceramic mould and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Pre-solid solution treatment: Mix Ni powder, W powder, Cr powder and Mo powder, and the weight ratio of each component is: Ni-22, W-16, Cr-6, Mo-6, and prepare 6 groups of equal amounts The raw material powders were put into ball milling tanks and carried out dry milling on a planetary ball mill. According to the specific process parameters shown in Table 1, a total of 6 groups of Ni-W-Cr corresponding to A1, A2, A3, A4, A5 and A6 were obtained. - Mo pre-solid solution powder;

[0018] Table 1 Binder phase pre-solid solution process

[0019] Numbering

[0020] A6

[0021] 2. Raw material mixing: the obtained A1, A2, A3, A4, A5, A6 total 6 groups of Ni-W-Cr-Mo pre-solid solution powders were respectively mixed with (W, Ti, Ta, Nb) (C, N) solid solution The powders are mixed, wherein the weight percentage of each component is: Ni-W-Cr-Mo pre-solid solution powder 50%, (W, Ti, Ta, Nb) (C, N) solid solution powder 50%; drop into the ball mill tank ...

Embodiment 2

[0034] 1. Pre-solution treatment: Mix Ni powder, W powder, Cr powder and Mo powder according to the proportions corresponding to the serial numbers 1, 2, 3, 4, 5, 6, and 7 in Table 5 to obtain the corresponding 7 groups The raw material powder is put into the ball mill tank and dry-milled on the planetary ball mill. According to the specific process parameters of the number A4 in Table 1, the corresponding P1, P2, P3, P4, P5, P6 and P7 are obtained. Group Ni-W-Cr-Mo pre-solid solution powder;

[0035] Table 5 Composition of non-magnetic cermets

[0036] sequence

[0037] 7

[0038] 2. Mixing of raw materials: P1, P2, P3, P4, P5, P6 and P7 a total of 7 groups of Ni-W-Cr-Mo pre-solid solution powder corresponding to the serial numbers 1, 2, 3, 4, Mix the (W, Ti, Ta, Nb) (C, N) solid solution powders of 5, 6, and 7, put them into a ball mill tank and perform wet milling on a planetary ball mill with a ball-to-material ratio of 7:1 and a speed of 180rpm , th...

Embodiment 3

[0049] 1. Pre-solid solution treatment: mix Ni powder, W powder, Cr powder and Mo powder according to the ratio of No. 4 in Table 5, and put them into a ball mill tank for dry grinding on a planetary ball mill, according to the number in Table 1 The concrete process parameter of A3, obtains Ni-W-Cr-Mo pre-solid solution powder;

[0050] 2. Raw material mixing: mix the obtained Ni-W-Cr-Mo pre-solid solution powder according to the weight percentage of No. 4 in Table 5 and (W, Ti, Ta, Nb) (C, N) solid solution powder, and put it into the ball mill Carry out wet grinding on the planetary ball mill in the tank, the ball-to-material ratio is 6:1, the rotating speed is 200rpm, and the time is 40 hours to obtain the mixed raw material;

[0051] 3. Compression molding: add 5% molding agent to the mixed raw materials, and then compression molding to obtain a compact, the molding pressure is 250MPa;

[0052] 4. Degreasing: Degrease the green compact by using a vacuum sintering furnace ...

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Abstract

The invention discloses a non-magnetic metal ceramic mould and a preparation method thereof, belongs to metal ceramic materials and solves the problems of low performance and insufficient wear resistance existing in the conventional non-magnetic hard alloy moulds. The non-magnetic metal ceramic mould is prepared from solid solution powder of (W, Ti, Ta, Nb) (C, N), Ni powder, W powder, Cr powder and Mo powder serving as raw materials, wherein the raw materials are sintered, so that in the finally produced phases, the hard phase is (W, Ti, Ta, Nb) (C, N) and the binder phase is Ni-W-Cr-Mo solid solution; the method comprises pre-solution treatment, raw material mixing, compression molding, degreasing and vacuum sintering in turn. The method is simple and economic; the prepared metal ceramic mould has hardness of between 89.5 and 91.5HRA, bending strength of more than or equal to 2,100MPa and fracture toughness KIC of more than or equal to 12.5MPa.m1/2; and thus the mould and the method have great popularization and application prospect in non-magnetic mould materials such as electrical engineering, electronics, automobiles and the like.

Description

technical field [0001] The invention belongs to cermet materials, in particular to a non-magnetic cermet mold and a preparation method thereof. Background technique [0002] With the rapid development of information technology, the application of magnetic materials such as NdFeB, ferrite, Sm-Co alloy, etc. is becoming more and more extensive, and its performance is also getting higher and higher. At present, these magnetic materials are mainly produced by powder metallurgy. However, since the magnetic crystals of the magnetic powder are anisotropic, a strong magnetic field is generally used to control the easy magnetization direction of the powder during compression molding, so that the easy magnetization direction of the compact is distributed along the specified direction. Therefore, it requires that the molding die must be non-magnetic in a certain direction. In addition, the watch case is also required to be non-magnetic and wear-resistant and corrosion-resistant. [...

Claims

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Application Information

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IPC IPC(8): B22C9/06C22C29/02B22F3/16
Inventor 熊惟皓瞿峻杨青青姚振华蔺绍江李俊周敏彭倩筠黄玉柱
Owner HUAZHONG UNIV OF SCI & TECH
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