Al2O3/Ti(C,N) composite ceramic tool material and microwave sintering process thereof

Active Publication Date: 2016-01-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high sintering temperature and long holding time lead to abnormal grain growth and uneven microstructure. The mechanical properties of the prepared material are not high, and the fracture toughness of the material is only 5.82MPa·m 1 / 2 , cannot meet the requirements of high-speed cutting on the mechanical properties of tools

Method used

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  • Al2O3/Ti(C,N) composite ceramic tool material and microwave sintering process thereof
  • Al2O3/Ti(C,N) composite ceramic tool material and microwave sintering process thereof
  • Al2O3/Ti(C,N) composite ceramic tool material and microwave sintering process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Press Al 2 o 3 1.875g, Ti(C,N)0.5g, Ni0.075g, Mo0.05g are batched; the powder after weighing is put into the planetary ball mill, and the medium is ball milled with an alumina ball for 24 hours with anhydrous ethanol; 2 hours before the end, add polyvinyl alcohol solution with a concentration of 3% to the mixed powder, and the quality of polyvinyl alcohol is 1% of the mixed powder mass; the mixed material after ball milling is dried, ground and sieved; the sieved powder One-way pressure compression molding, molding pressure 200MPa, pressure holding time 2min; under nitrogen atmosphere, microwave sintering was carried out in a microwave sintering furnace with a frequency of 2.45GHz, and the temperature was raised to 1500°C at a heating rate of 30°C / min. Keep it warm for 5 minutes, then cool down to room temperature with the furnace.

Embodiment 2

[0026] Press Al 2 o 3 1.75g, Ti(C,N)0.625g, Ni0.075g, Mo0.05g are carried out batching; The powder after weighing is packed in the planetary ball mill, with anhydrous ethanol as medium use alumina ball mill for 48 hours; 2 hours before the end, add polyvinyl alcohol solution with a concentration of 5% to the mixed powder, and the quality of polyvinyl alcohol is 5% of the mixed powder mass; the mixed material after ball milling is dried, ground and sieved; the sieved powder One-way pressure compression molding, molding pressure 200MPa, pressure holding time 2min; under nitrogen atmosphere, use 2.45GHz frequency microwave sintering furnace for microwave sintering, and raise the temperature to 1500℃ at a heating rate of 40℃ / min, at this temperature Keep it warm for 10 minutes, then cool down to room temperature with the furnace.

Embodiment 3

[0028] Press Al 2 o 31.75g, Ti(C,N)0.625g, Ni0.075g, Mo0.05g are carried out batching; The powder after weighing is packed in the planetary ball mill, with anhydrous ethanol as medium use alumina ball mill for 48 hours; 3 hours before the end, add polyvinyl alcohol solution with a concentration of 3% to the mixed powder, and the quality of polyvinyl alcohol is 3% of the mixed powder mass; the mixed material after ball milling is dried, ground and sieved; the sieved powder One-way pressure compression molding, molding pressure 300MPa, pressure holding time 2min; under nitrogen atmosphere, microwave sintering was carried out in a microwave sintering furnace with a frequency of 2.45GHz, and the temperature was raised to 1550°C at a heating rate of 40°C / min. Keep it warm for 15 minutes, then cool to room temperature with the furnace.

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Abstract

The invention discloses an Al2O3 / Ti(C,N) composite ceramic tool material and a microwave sintering process thereof. The Al2O3 / Ti(C,N) composite ceramic tool material is prepared from, by mass, 61%-70% of alumina (Al2O3), 25%-35% of titanium carbonitride (Ti(C,N)), 2%-6% of nickel (Ni) and 1%-3% of molybdenum (Mo). Ceramic tool materials are sintered in a microwave sintering furnace with nitrogen as protection atmosphere through the characteristics that whole microwaves can conduct non-gradient heating, material compactness is promoted and environment friendliness is achieved, wherein the frequency of the microwave sintering furnace is 2.45 GHz. The prepared tool material is uniform in microstructure and small in crystalline grain, has high density, high fracture toughness and high harness, and the performance of the prepared tool material meets the use requirement of tools; meanwhile, the sintering process is advanced, the production efficiency is high, cost is low, large-scale production can be easily conducted, and popularization value is achieved.

Description

technical field [0001] The invention relates to the technical field of microwave sintering materials, in particular to an Al 2 o 3 / Ti(C,N) composite ceramic tool material and its microwave sintering process. Background technique [0002] Al 2 o 3 Ceramic-based tool material is a widely used high-speed cutting tool material. It has high hardness, high wear resistance, high heat resistance and good chemical stability in the field of high-speed cutting and cutting hardened steel, nickel-based superalloys, etc. Difficult-to-machine materials have shown incomparable advantages over traditional cutting tools. As we all know, Al 2 o 3 / TiC ceramic tools have good cutting performance when cutting hardened steel at high speed. Compared with TiC, Ti(C,N) has better mechanical properties. It has both the high hardness of TiC and the high toughness of TiN, and the friction coefficient between Ti(C,N) and metal is smaller. Therefore, Ti (C,N) is more suitable for preparing ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/64
Inventor 殷增斌袁军堂程寓汪振华胡小秋
Owner NANJING UNIV OF SCI & TECH
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