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Super-fine TiC0.7N0.3 base metal ceramic and preparing method

A cermet and composition technology, applied in the field of ultrafine TiC0.7N0.3-based cermet and its preparation, can solve the problems of unstable product performance, insufficient strength and toughness, etc., to reduce defect formation, improve material density, inhibit The effect of decomposition

Inactive Publication Date: 2007-11-14
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Therefore, although Ti(C,N)-based cermets have been greatly developed at home and abroad in recent years, the main problems of the above-mentioned marketed products and patented technologies are still insufficient strength and toughness, and unstable product performance.

Method used

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  • Super-fine TiC0.7N0.3 base metal ceramic and preparing method

Examples

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Effect test

example 1

[0038] Example 1: The particle size of each component is: TiC 0.7 N 0.3 : 0.05~0.13μm; WC: 0.2~0.4μm; Mo 2 C: 0.4 0.7 μm; TaC: 0.8-1 μm; Ni / Co: 2 C: 10wt%; WC: 15wt%; TaC: 7wt%; NiCo: 14.5wt% (and Co:Ni=60:40); the rest is TiC 0.7 N 0.3 solid solution. Ultrafine TiC 0.7 N 0.3 The deoxidation treatment of powder in H 2 It is carried out in a protected continuous propulsion type moss calcination furnace. Ultrafine TiC 0.7 N0.3 The powder is placed on a clean graphite boat and sent into the H 2 Deoxidation treatment is carried out in a protected continuous propulsion type moss calciner, the boat pushing speed is 20 boats / min, the high temperature zone temperature is 400°C, H 2 Velocity 2m 3 / Hour. The morphology after treatment is shown in Figure 1, and the composition analysis is shown in Table 3. Then mix various carbides, carbonitrides and metal powders according to the weight percentage of the composition, and grind them in a drum type wet mill. The wet grinding m...

example 2

[0045] Example 2: The particle size of each component is: TiC 0.7 N 0.3 : 0.05~0.13μm; WC: 0.2~0.4μm; Mo 2 C: 0.4-0.7 μm; TaC: 0.8-1 μm; Ni / Co: 2 C: 13wt%; WC: 15wt%; TaC: 8wt%; NiCo: 13wt% (and Co:Ni=60:40); the rest is TiC 0.7 N 0.3 solid solution. Ultrafine TiC 0.7 N 0.3 The deoxidation treatment of other powders is carried out in a vacuum sintering furnace. Ultrafine TiC 0.7 N 0.3 Put the powder on a clean graphite boat, send it into a vacuum sintering furnace for deoxidation treatment, and keep it warm at 1500°C for 1 hour with a vacuum degree of 0.5Pa. The morphology after treatment is shown in Figure 4, and the component analysis is shown in Table 5. Then mix various carbides, carbonitrides and metal powders according to the weight percentage of the composition, and grind them in a drum type wet mill. The wet grinding medium is hexane, and the grinding balls are WC-8wt% Co cemented carbide balls. The grinding speed is 68r / min, the grinding time is 48h, the dia...

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Abstract

This invention has publicized one kind of superfine cermet and its preparation method. Each composition ingredient weight percent of this cermet is: Mo2C: 8-13wt %; WC: 10-15wt %; TaC: 5-8wt %; NiCo:10.5-14.5wt % (also Co: Ni = 60: 40); the reminder is TiC0.7N0.3. This cermet uses the superfine TiC0.7N0.3 solid solution as raw material powder, and deoxidation process the superfine powder, it solved the technical difficult problems of preparation superfine cermet such as wet milling easy to to be agglomeration, compaction easy to dehiscence and easy to form holes after being sintered because powder granularity thin and breath. The processed powder adopt optimization wet milling craft, and add stearic acid mountain ash grain fat dispersing agent; Suppressed under 300 -400MPa pressure to shape; do dewaxing under 10-15Pa higher than vacuum degree; sinter vacuum degree is higher than 1-5X10-2Pa, sinter temperature is 1400degree C-1,480degree C, then holding 1-1.5h; do the hot isostatic pressing processing at 1,350degree C, holding 90-120min, the argon pressure is 70-120MPa. The prepared cermet has crystal grain size 0.5mum and the typical core - link structure, its hardness is>=93HRA, anti-curved intensity>=2200MPa, it may used as half precision work and precision work cutting tool material.

Description

technical field [0001] The invention relates to cermets and a preparation method thereof, in particular to ultrafine TiC 0.7 N 0.3 Base cermets and methods for their preparation. Background technique [0002] Ti(C,N)-based cermets use Ti(C,N) as the main hard phase, Ni / Co as the binder phase, and add WC, Mo 2 C, TaC, VC, ZrC, Cr 3 C 2 , HfC and other carbides to improve performance. Compared with traditional carbide tool materials, cermets have excellent hardness, wear resistance, excellent chemical stability, oxidation resistance and anti-sticking ability and low friction coefficient. Therefore, cermets can be used as cutting tools for difficult-to-machine materials such as high-manganese steel, alloy structural steel, special cast iron (such as niobium-containing, boron-containing, high-chromium and hard cast iron, etc.), high-temperature alloys, rolls, and thermal spray coating materials. , and can allow higher cutting speed and larger feed rate to improve productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06B22F9/00B22F1/00C22C1/05B22F3/12
Inventor 熊计郭智兴杨梅沈保罗
Owner SICHUAN UNIV
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