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Solid-solution powder, method to prepare the solid-solution powder, ceramic using the solid-solution powder, method to prepare the ceramic, cermet powder including the solid-solution powder, method to

A solid solution, cermet technology, applied in the direction of metal processing equipment, non-metallic elements, nitrogen and non-metallic compounds, etc., can solve problems such as failure to provide solid solutions

Inactive Publication Date: 2006-11-01
财团法人SEOUL大学校产学协力财团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, numerous industrial attempts to target this homogeneity have failed to provide this solid solution
[0019] Specifically, according to the prior art, it is impossible to obtain a homogeneous solid solution phase without a core / ring structure under low temperature of 1300°C or lower and short reduction and carbonization conditions because of the formation of solid solution phase, and the amount of solid solution phase formed depends on the temperature and time of the sintering process, which requires a high temperature of 1400°C or higher and a long time

Method used

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  • Solid-solution powder, method to prepare the solid-solution powder, ceramic using the solid-solution powder, method to prepare the ceramic, cermet powder including the solid-solution powder, method to
  • Solid-solution powder, method to prepare the solid-solution powder, ceramic using the solid-solution powder, method to prepare the ceramic, cermet powder including the solid-solution powder, method to
  • Solid-solution powder, method to prepare the solid-solution powder, ceramic using the solid-solution powder, method to prepare the ceramic, cermet powder including the solid-solution powder, method to

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] As an example, using 99+% pure anatase-TiO 2 , NiO with a purity of 99% (average particle size is 45μm) and WO with a purity of 99+% 3 (The average particle size is 20 μm).

[0118] The above components were mixed with carbon powder to obtain the following 5 target compositions: (i) (Ti, W) C-Ni (containing 15% by weight WC), (ii) (Ti, W) C-Ni (containing 30% by weight WC), (iii) (Ti, W) (C, N)-Ni (containing 15% by weight WC, C / N=2:1), (iv) (Ti, W) (C, N) -Ni (with 30 wt% WC, C / N=3:1) and (v) (Ti,W)C (with 15 wt% WC), (vi)(Ti,W)C (with varying WC content).

[0119] The above mixture was milled, ie, milled with high-energy balls using a planetary mill (Fritsch Pulverisette 7). Tungsten carbide (WC) balls with a diameter of 5 mm were used as milling media and mixed with the powder at a ball: powder weight ratio of 20:1.

[0120] Tungsten carbide bowls were used and all grinding was performed in air at 250 RPM for 20 hours.

[0121] Here, the milled nanopowders were ...

Embodiment 2

[0158] As an example, a simple target composition is first selected, for which TiO with a crystal size of 100 nm is prepared according to the respective contents 2 、WO 3 , NiO nano oxide.

[0159] As the target composition, the following two compositions were selected: (i) (Ti, W)C-Ni (containing 15 wt% WC), (ii) (Ti, W)C-Ni (containing 30 wt% WC).

[0160] Mix and grind the carbon powder and the prepared above-mentioned nano-oxide, and put the ground nano-powder under vacuum or hydrogen, CH 4 、CO / CO 2 Annealed at 1300°C for 2 hours in atmosphere to reduce and carbonize it.

[0161] During sintering of the prepared cermet powder, nitrogen gas of 1-100 Torr is introduced into the furnace at the sintering temperature, and the pressure (1-100 Torr) is formed and maintained until the cooling process.

[0162] Figure 4a To show the FE-SEM image of a sintered sample (1510° C., 1 hour) of (Ti, W)C—Ni cermet powder (containing 15 wt. % WC) prepared in a nitrogen atmosphere accor...

Embodiment 3

[0171] As an example, a simple target composition is first selected, for which TiO with a crystal size of 100 nm is prepared according to the respective contents 2 、WO 3 , NiO nano oxide.

[0172] As the target composition, the following four compositions were selected: (i) (Ti, W) C-Ni (containing 15% by weight of WC), (ii) (Ti, W) C-Ni (containing 30% by weight of WC), (iii) (Ti,W)CN-Ni (containing 15 wt% WC) and (iv) (Ti,W)CN-Ni (containing 30 wt% WC).

[0173] Mix and grind the carbon powder and the prepared above-mentioned nano-oxide, and put the ground nano-powder under vacuum or hydrogen, CH 4 P. CO / CO 2 Annealed at 1300°C for 2 hours in atmosphere to reduce and carbonize it. In the case of carbonitrides, nitrogen gas is injected into the vacuum furnace.

[0174] During sintering of the prepared cermet powder, a vacuum atmosphere (or argon, nitrogen) is used. In addition, a TiN coating was formed on the surface of the sintered cermet by PVD method. TiN coating ex...

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Abstract

Disclosed are a solid-solution powder, a method for preparing the solid-solution powder, a ceramic using the solid-solution powder, a method for preparing the ceramic, a cermet powder including the solid-solution powder, a method for preparing the cermet powder, a cermet using the cermet powder and a method for preparing the cermet. According to the present invention, the problem of low toughness due to high hardness that conventional cermets (especially TiC or Ti(CN) based cermet) have is resolved because a complete solid-solution phase without core / rim structure can be obtained as a microstructure, and wherein further increased the hardness as well as the toughness, thereby substantially and considerably increasing general mechanical properties of materials using the ceramic or the cermet and thus substituting WC-Co hard material and allowing manufacturing of cutting tools with high hardness and toughness, and wherein the complete solid-solution phase without core / rim structure can be obtained even in the reducing and carburizing condition of low temperature of 1300 DEG C or less and relatively short time, thereby increasing an efficiency of the overall process.

Description

technical field [0001] The present invention relates to a solid solution powder, a method for preparing the solid solution powder, a ceramic using the solid solution powder, a method for preparing the ceramic, a cermet powder comprising the solid solution powder, a method for preparing the cermet powder, a metal ceramic using the A cermet of ceramic powder and a method for preparing the cermet, which is suitable for high-speed cutting tools and molds in the mechanical industry such as machine building, automation industry, etc., in order to improve general mechanical properties, especially the stiffness and hardness of the material. Background technique [0002] Herein, "nano-sized" refers to the well-known size of 100 nm or less. [0003] In this article, both capital letters W, M1, M2... and lowercase letters w, m are used 1 、m 2  … The purpose is to use lowercase letters w, m 1 、m 2 ...to indicate a smaller amount of metal than capital letters W, M1, M2... [0004] ...

Claims

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Application Information

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IPC IPC(8): C04B35/56C01B21/084C01B31/30C04B35/624
CPCB22F2998/10B22F2999/00B82Y30/00C01B21/0828C01P2002/50C01P2002/72C01P2004/03C01P2004/04C01P2004/64C04B35/5611C04B35/5626C04B35/58021C04B35/62615C04B35/6265C04B35/6268C04B41/009C04B41/5061C04B41/87C04B2235/3232C04B2235/3258C04B2235/3839C04B2235/3843C04B2235/3847C04B2235/3856C04B2235/3886C04B2235/3895C04B2235/422C04B2235/44C04B2235/442C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/549C04B2235/77C04B2235/81C22C1/051C22C1/056C22C29/02C01B32/90C01B32/907C04B41/4529C04B41/5068C04B41/5144C04B35/56B22F9/04B22F9/22B22F3/10B22F1/07A45D20/12A45D2200/202A45D2200/205
Inventor 姜信候
Owner 财团法人SEOUL大学校产学协力财团
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