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Composite cermet and its preparing process

A composite metal and ceramic technology, applied in the field of composite Ti-based cermets and its preparation, can solve the problems of cermet knives not being practically used, unstable performance, low strength and toughness, etc., and achieve excellent chemical stability and low friction coefficient , excellent toughness effect

Inactive Publication Date: 2002-05-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country also invested a lot of manpower and material resources during the Eighth Five-Year Plan period and has developed some brands of Ti(C,N)-based metal-ceramic knives, which are now being tried on the market, but the problems reflected are unstable performance and low toughness. Under the condition of higher speed, the vibration is very large, so these brands of cermet knives have basically not been practically used so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The pressure used in the mechanical alloying process is 0.2MPa, the speed is 350rpm, and the time is 96h.

[0029] The addition of forming agent polyvinyl alcohol is 4wt%,

[0030] The pressure used for compression molding is 400MPa,

[0031] The degreasing process is carried out under the condition that the degree of vacuum is higher than 5Pa, the holding temperature is 600° C., and the holding time is 10 hours.

[0032] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1410°C, the holding time is 40min,

[0033] The argon pressure used in the hot isostatic pressing furnace is 100MPa, the treatment temperature is 1400°C, and the holding time is 30min.

[0034] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 4.

[0035] Table 4 Properties of different cermets prepared by process 1

[0036] ingredient 1 # 2 # ...

Embodiment 2

[0040] The pressure used in the mechanical alloying process is 0.5MPa, the speed is 350rpm, and the time is 120h.

[0041] The addition of forming agent polyvinyl alcohol is 6wt%,

[0042] The pressure used for compression molding is 300MPa,

[0043] The degreasing process is carried out under the condition that the degree of vacuum is higher than 5 Pa, the holding temperature is 500° C., and the holding time is 6 hours.

[0044] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1440°C, the holding time is 60min,

[0045] The argon pressure used in the hot isostatic pressing furnace is 100MPa, the treatment temperature is 1370°C, and the holding time is 40min.

[0046] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 5.

[0047] Table 5 Properties of different cermets prepared by process 2

[0048] ingredient 1 # 2 # 3 ...

Embodiment 3

[0052] The pressure used in the mechanical alloying process is 0.8MPa, the speed is 400rpm, and the time is 132h.

[0053] The addition of forming agent polyvinyl alcohol is 8wt%,

[0054] The pressure used for compression molding is 250MPa,

[0055]The degreasing process is carried out under the condition that the degree of vacuum is higher than 5 Pa, the holding temperature is 400° C., and the holding time is 6 hours.

[0056] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1480°C, the holding time is 80min,

[0057] The argon pressure used in the hot isostatic pressing furnace is 150MPa, the treatment temperature is 1350°C, and the holding time is 50min.

[0058] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 6.

[0059] Table 6 The performance components of different cermets prepared by process 3 1 # 2 # 3 # 4 ...

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PUM

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Abstract

A composite cermet contains Ti (25-30), C (6-8.5), Ni (25-40), Mo (12-20), N (2-3), W (5-10) and Cr (0.4-1), and it prepared through mixing powdered Ti, C, Ni and Mo, Mechanically alloying under protection of argon to prepare nano TiCx and NiMo sosoloid mixture, mixing with TiN, WC, CR2C2 and C powder, adding shaping agent, die pressing, high-vacuum degreasing, high-vacuum sintering and isostatic pressing at 100-150 MPa and 1350-1400 deg.C. It has high hardness and bending strength, and can be used for cutting tools and dies.

Description

technical field [0001] The invention relates to a ceramic material and a manufacturing method thereof, in particular to a composite Ti(C, N)-based cermet and a manufacturing method thereof. Background technique [0002] Ti(C,N)-based cermets not only have high hardness, wear resistance, red hardness, excellent chemical stability, and extremely low friction coefficient between metals, but also have certain toughness and strength. If it is used as a cutting tool, it has obvious advantages in the following aspects compared with the usual cemented carbide: it can allow higher cutting speed and larger feed rate, and the workpiece to be processed has better surface properties. , the tool wear resistance is higher. At present, the main grades in the Japanese market are shown in Table 1, and see the article "Ti(C, N)-based metal materials" by Zhang Guojun, China Academy of Building Materials Science, Mechanical Engineering Materials, No. 3, 1990. my country also invested a lot of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/622C04B35/634
Inventor 熊惟皓郑勇李晨辉宋校军胡耀波周凤云张杰
Owner HUAZHONG UNIV OF SCI & TECH
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