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Composite ceramic cutter material and preparation method thereof

A technology for tool materials and composite ceramics, applied in the field of ceramic tool materials, can solve the problems of difficulty in obtaining nano-scale TiC-WC solid solution, inability to improve high temperature mechanical properties of materials, inconvenient to adjust the relative content of hard phases, etc., and achieve good fracture toughness. , The effect of high bending strength and high hardness

Inactive Publication Date: 2011-11-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the addition of hard phases in the form of TiC-WC solid solution can increase the hardness to a certain extent, it is not convenient to adjust the relative content of hard phases; moreover, it is difficult to obtain nano-scale TiC-WC solid solution at the current technical level, and it is impossible to use nanoparticles to enhance the hardness. characteristics of toughness
Although adding some metals to composite ceramic materials can enhance the bonding strength of the material structure, it is limited to improving the strength at low temperature, and still cannot improve the high temperature mechanical properties of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 60% micron Al by volume percentage 2 o 3 (0.5 μm), 21% TiC (140nm), 18% micron WC (0.4 μm), 0.5% micron MgO and 0.5% micron NiO. Using polyethylene glycol as a dispersant and deionized water as a dispersion medium, prepare an aqueous solution containing 0.0335% by mass of polyethylene glycol; add titanium carbide powder to the aqueous solution to prepare a suspension with a mass percentage of TiC of 6.7% Liquid, put it on an ultrasonic dispersing mixer for 15-20 minutes to disperse, and after taking it off, adjust the pH value of the suspension to 9.5-10 to make the suspension alkaline. Micron Al 2 o 3 , WC, MgO and NiO are mixed with the prepared suspension, dispersed on an ultrasonic dispersion mixer for 20-30 minutes, then poured into a mixing bucket, mixed on a planetary ball mill for 48-72 hours, and then vacuum-dried, Sieve to obtain a well-dispersed composite powder. Using hot pressing sintering process, sintering in a high-purity nitrogen protective at...

Embodiment 2

[0022] 64% micron Al by volume 2 o 3 (0.5 μm), 31.5% TiC (140nm), 3.5% micron WC (0.4 μm), 0.5% micron MgO and 0.5% micron NiO. Dispersion was carried out according to the same process and parameters as in Example 1 to obtain a TiC suspension with a pH value of 9.5-10. Micron Al 2 o 3 , WC, MgO and NiO are mixed with the prepared suspension, dispersed on an ultrasonic dispersion mixer for 20-30 minutes, then poured into a mixing bucket, mixed on a planetary ball mill for 60-72 hours, and then vacuum-dried, Sieve to obtain a well-dispersed composite powder. The composite powder material is sintered in a high-purity nitrogen protective atmosphere by hot-pressing sintering process, and the temperature is raised to the holding temperature at a heating rate of 75-80°C / min, and the pressure is uniformly increased to 30MPa; the holding temperature is 1650-1750°C, and the pressure is 30MPa , holding time 30 minutes.

[0023] The mechanical properties of the obtained composite ce...

Embodiment 3

[0025] 54% micron Al by volume 2 o 3 (0.5 μm), 40% TiC (140nm), 5% micron WC (0.4 μm), 0.5% micron MgO and 0.5% micron NiO. Dispersion was carried out according to the same process and parameters as in Example 1 to obtain a TiC suspension with a pH value of 9.5-10. Micron Al 2 o 3 , WC, MgO and NiO are mixed with the prepared suspension, dispersed on an ultrasonic dispersion mixer for 20-30 minutes, then poured into a mixing bucket, mixed on a planetary ball mill for 60-72 hours, and then vacuum-dried, Sieve to obtain a well-dispersed composite powder. The composite powder material is sintered in a high-purity nitrogen protective atmosphere by hot-pressing sintering process, and the temperature is raised to the holding temperature at a heating rate of 75-80°C / min, and the pressure is uniformly increased to 30MPa; the holding temperature is 1650-1750°C, and the pressure is 30MPa , holding time 20 minutes.

[0026] The mechanical properties of the obtained composite cerami...

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Abstract

The invention provides a composite ceramic material for cutting tools and a production method thereof. The composite ceramic material for cutting tools contains the following components in volume percentages: 54%-64% of micrometer-sized Al2O3, 21%-40.5% of nano-sized TiC, 3.5%-18% of micrometer-sized WC, 0.5% of micrometer-sized MgO and 0.5% of micrometer-sized NiO. The production method comprises the following steps: (1) material preparation; (2) dispersion of TiC nanoparticles; (3) material mixing to obtain a composite powder material; and (4) sintering: performing hot-press sintering process in the presence of nitrogen protective gas. Based on the addition of nano-sized TiC particles and micrometer-sized WC particles in micrometer-sized Al2O3, the control of volume contents of the nano-sized TiC particles and micrometer-sized WC particles and the utilization of MgO and NiO as sintering additives, the invention can successfully produce high-performance composite ceramic material for cutting tools. The material has high mechanical property; and the Vickers hardness, bending strength and fracture toughness of the material reach 20 GPa, 860 MPa and 5.9 MPa*m<1 / 2> respectively.

Description

technical field [0001] The invention relates to a composite ceramic cutting tool material and a preparation method thereof, belonging to the technical field of ceramic cutting tool materials. Background technique [0002] Ceramic tools have high hardness, good wear resistance, are not easy to bond with metals, and have good chemical stability. They have incomparable advantages in the field of processing difficult-to-machine materials than cemented carbide tools. At the same time, the main components of ceramic knives, such as aluminum and silicon, come from a wide range of sources. The development and use of ceramic knives can save the consumption of strategic precious metals (mainly tungsten). However, the inherent brittleness of the ceramic tool material limits its application range, and the tool often fails due to damage during processing. Therefore, it is very meaningful to study how to improve the fracture toughness and flexural strength of ceramic tool materials on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/622
Inventor 袁训亮赵军周咏辉
Owner SHANDONG UNIV