Method for preparing tungsten carbide-zirconium oxide-aluminum oxide composite knife material

A composite cutting tool and zirconia technology, applied in the field of material science, can solve the problems of low hardness and achieve the effects of high flexural strength, uniform composition and particle size distribution, and high temperature stability of fracture toughness

Inactive Publication Date: 2008-02-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both have high strength, but both have the problem of low hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Micron WC (0.4μm)+micron ZrO 2 (0.5μm)+nano Al 2 o 3 (80nm), the content of each component in the composite material is: 10wt% ZrO 2 , wt2% Al 2 o 3 , 0.4wt% VC, 0.3wt% TaC, and the rest is WC. Using sodium polyphosphate as a dispersant and deionized water as a dispersion medium, prepare an aqueous solution containing 0.25 wt% sodium polyphosphate; adding alum carbide powder with a grain size of 2 microns to the solution to form a 0.2 wt% solution Put the suspension on an ultrasonic dispersing mixer for 5 to 10 minutes, and remove the solution from the ultrasonic dispersing machine; in the same way, put tantalum carbide with a particle size of 1 micron into the solution, and prepare a solution containing tantalum carbide with a mass fraction of 0.15wt% suspension, disperse on an ultrasonic mixer for 5-10 minutes, remove the suspension from the ultrasonic machine; adjust the pH value of the suspension to 8.9-9.5 to make the suspension alkaline, and mix the nano-alum...

Embodiment 2

[0018] Micron WC (0.4μm)+micron ZrO 2 (0.5μm)+nano Al 2 o 3 (80nm), the content of each component in the composite material is: 12wt% ZrO 2 , 1 wt% Al 2 o 3 , 0.4wt% VC, 0.3wt% TaC, and the rest is WC. Dispersion process and parameters are the same as in Example 1. Micron WC and ZrO 2 and nano Al 2 o 3It is mixed with the prepared VC and TaC suspension, mixed by planetary ball mill in a mixing tank for 60-72 hours, then vacuum-dried and sieved to obtain a well-dispersed composite powder. It adopts staged heating, uniform pressure and hot pressing sintering process, and high-purity nitrogen protection. When the temperature is between room temperature and 1500°C, the heating rate is 75-80°C / min, the pressure is evenly increased to 30MPa, and the temperature is maintained for 10 minutes; when the temperature is between 1500-1650°C, the heating rate is 80-100°C / min, and the pressure is constant at 30MPa; The stage temperature is 1650°C, the pressure is 30MPa, and the tem...

Embodiment 3

[0021] Micron WC (0.8μm)+micron ZrO 2 (0.5μm)+nano Al 2 o 3 (80nm), the content of each component in the composite material is: 10wt% ZrO 2 , 5 wt% Al 2 o 3 , 0.4wt% VC, 0.3wt% TaC, and the rest is WC. Dispersion process and parameters are the same as in Example 1. Micron WC and ZrO 2 and nano Al 2 o 3 It is mixed with the prepared VC and TaC suspension, mixed by planetary ball mill in a mixing tank for 60-72 hours, then vacuum-dried and sieved to obtain a well-dispersed composite powder. It adopts staged heating, uniform pressure and hot pressing sintering process, and high-purity nitrogen protection. When the temperature is from room temperature to 1600°C, the heating rate is 75-80°C / min, the pressure is evenly increased to 30MPa, and the temperature is maintained for 10 minutes; when the temperature is 1650-1700°C, the temperature is increased at a rate of 80-100°C / min, and the pressure is constant at 30MPa; The stage temperature is 1700°C, the pressure is 30MPa, ...

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Abstract

The invention belongs to the technical field of material science and relates to a preparation method of a tungsten carbide-zirconia-alumina composite cutting tool material. In the invention, submicron-scale ZrO2 particles and nano-scale Al2O3 powder are added to the sub-micron-scale WC matrix, and the micro-scale VC and TaC particles are used as inhibitors. A new type of composite tool material with ZrO2 and Al2O3 as the matrix as the matrix. By adding submicron ZrO2 particles and nano-Al2O3, the high temperature stability and oxidation resistance of the WC matrix are improved. The composite tool material has high comprehensive mechanical properties, and its hardness, flexural strength, and fracture toughness can reach: 18GPa , 880MPa and 13MPa.m1 / 2.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to a preparation method of tungsten carbide-zirconia-alumina composite tool material. Background technique [0002] Among the current cutting tool materials, WC-Co (YG type) cemented carbide is widely used due to its good machinability, high strength and fracture toughness and good thermal conductivity, but due to the second phase composition Features such as the low melting point of the binder metal Co, which leads to softening at higher temperatures (850°C), and the high chemical activity of Co, which is easy to react and diffuse with other elements at high temperatures, etc., looking for alternatives to Co as a binder The topic of medicine becomes very meaningful. And Al 2 o 3 Base, ZrO 2 The base ceramic has good chemical stability and has little affinity with iron-based metals, so it is not easy to bond and diffuse. al 2 o 3 The solubility in iron is only 1 / 5 of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 艾兴赵军杨发展
Owner SHANDONG UNIV
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