Metal ceramic and its preparation method

A cermet and ceramic powder technology, applied in the field of Ti-based cermet and its preparation, can solve the problems of insufficient strength and toughness, unstable product performance, etc., and achieve the effects of excellent strength and toughness, excellent chemical stability, and low friction coefficient

Inactive Publication Date: 2003-04-16
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Ti (C, N) and (Ti, W, Ta) (C, N) carbonitride ceramic powder with a particle size of 1.0 (Fsss, the same below) and consistent with the set final composition weight percentage , (Ti, W, Ta) C, WC, TiC, ZrC, NbC and Mo2C carbide ceramic powder mixed with metal Ni, Co powder and wet ball milled for 48 to 96 hours, in Ti (C, N) powder N / ( N+C)=0.7 (weight ratio, the same below); N / (N+C)=0.37 in (Ti, W, Ta) (C, N) powder, Ti0.7, W0.2, Ta0.1 ( weight percentage, the same below). Precipitate the prepared mixture for 36 to 96 hours, dry it in vacuum, then add the forming agent styrene-butadiene-styrene insert polymer, the added weight is 10% of the weight of the mixture, dry, granulate and press after mixing Forming, and then dewaxing in a vacuum furnace, the vacuum degree is higher than 5Pa, and the temperature is kept at 300°C for 120min, 520°C for 120min, and then vacuum sintering is carried out, the vacuum degree is higher than 0.1Pa, and the temperature is rai...

Embodiment 2

[0016] Example 2: Ti (C, N) and (Ti, W, Ta, Nb) (C, N) carbonitride ceramic powders, (Ti, W, Ta, Nb)C, WC, TiC, ZrC, TaC, and VC carbide ceramic powders were mixed with metal Ni, Co, Mo powders and wet-milled in a high-energy ball mill for 20 hours, in which Ti (C, N) powders contained N / (N+C)=0.65; N / (N+C)=0.3 in (Ti, W, Ta, Nb)(C, N) powder, Ti0.7, W0.1, Ta0.1, Nb0.1. The prepared mixture was directly vacuum-dried without precipitation, and then added polyvinyl alcohol as a molding agent, the added weight was 8% of the weight of the mixture, after mixing, it was dried, granulated, pressed and formed, and then dewaxed in a vacuum furnace. During the treatment, the vacuum degree is higher than 5Pa, and it is kept at 350°C for 150min, and at 600°C for 150min; then vacuum sintering is carried out, the vacuum degree is higher than 0.1Pa, the temperature is raised to 1300°C and kept for 30min, and then the temperature is raised to 1480°C and kept for 90min. Finally cool under va...

Embodiment 3

[0018] Embodiment 3: Ti (C, N) and (Ti, W, Ta, Nb, Mo) (C, N) carbonitride ceramic powder, ( Ti, Ta)C, WC, TiC, ZrC, Cr 3 C 2 and Mo 2C carbide ceramic powder mixed with metal Ni and Co powder and wet ball milled for 72 hours, wherein N / (N+C)=0.65 in Ti(C,N) powder; (Ti,W,Ta,Nb,Mo)(C, N) N / (N+C)=0.5 in powder, Ti0.7, W0.1, Ta0.1, Nb0.05, Mo0.05. Precipitate the prepared mixture for 96 hours, dry it in vacuum, then add the forming agent styrene-butadiene-styrene insert polymer, the added weight is 15% of the weight of the mixture, dry, granulate and press to form after mixing, Then carry out dewaxing treatment in a vacuum furnace with a vacuum degree higher than 5 Pa, and keep it at 250°C for 150 minutes, and keep it at 550°C for 150 minutes; then carry out vacuum sintering with a vacuum degree higher than 0.1Pa, and heat it up to 1300°C for 30 minutes. , then raised the temperature to 1490°C, kept the temperature for 75 minutes, and finally cooled in a vacuum environment. ...

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Abstract

The invention discloses the Ti(C,N) based metal ceramics and its preparation method. The weight ratio of each constituent of the metal ceramics is as following Ti30-65, W8-25, Ta1.0-15.0, Zr 0.1-5.0,Nb0-10, Cr0-1.0 V 0-5.0 etc as well as C and N as the rest. The powder of ceramics of carbonitride with multiple elements in duplex type of two or more different element combinations is mixed with the powder of carbide of Ti, W, Ta, Nb, V, Zr etc. and / or powders of carbide of their solid solution as well as the powders of Co, Ni, Mo. The metal ceramics are made from the admixture through the procedures of ball mill crushing, pressure moulding, vacuum dewaxing and vacuum sintering. With the good wear resistance being kept, the metal ceramics possesses high intensity and toughness.

Description

technical field [0001] The invention relates to a ceramic material and a preparation method thereof, in particular to a Ti(C, N)-based cermet and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermet is a new type of cermet material born in the 1970s. It has low density, good chemical stability and oxidation resistance, small friction coefficient against steel, and hardness and The red hardness is higher than that of cemented carbide. Ti(C,N)-based cermets are used as tool materials, suitable for high-speed cutting and dry cutting of cast iron, ordinary steel, and high-hardness steel, especially in finishing and semi-finishing, which are better than cemented carbide and coated Therefore, enterprises and research institutions in various countries have done a lot of work in the research of Ti(C,N)-based cermets in recent years, and some products have been put on the market. Taking the Japanese market as an example, Ti(C,N)-based cermet tools accoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/00
Inventor 徐智谋易新建郑家燊唐宏翚李祥辉江丙武彭德麟
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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