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TiCN/Al2O3 metal ceramic cutter and microwave preparation process thereof

A cermet and preparation technology, applied in the field of microwave sintering material science, can solve the problems of materials affecting mechanical properties, reducing material fracture toughness, etc., and achieve the effects of simple process equipment, improved fracture toughness, and low cost

Inactive Publication Date: 2015-10-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese invention patent (CN104480364A) discloses a kind of Al 2 o 3 -TiCN / Co-Ni cermet mold material and preparation method thereof, the cermet is made of Al 2 o 3 Composed of 40%-70%, TiCN micron powder 30%, Co, Ni 0%-30%, using vacuum hot pressing sintering technology to prepare ceramic materials with high mechanical properties, but its Al 2 o 3 As the matrix, although the hardness of the material can be guaranteed, the fracture toughness of the material is reduced. At the same time, because the vacuum hot pressing sintering is easy to generate a thermal gradient inside the material during the sintering process, it is very easy to generate thermal stress inside the material and affect its own mechanics. performance

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  • TiCN/Al2O3 metal ceramic cutter and microwave preparation process thereof
  • TiCN/Al2O3 metal ceramic cutter and microwave preparation process thereof

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Effect test

Embodiment 1

[0024] combine figure 1 , a TiCN / Al of the present invention 2 o 3 Microwave preparation of cermet tool materials by mass percentage TiCN 40%, α-Al 2 o 3 15%, Mo 2 C 10%, WC 10%, Co and Ni 25% ingredients are mixed by ball milling, and a polyvinyl alcohol solution with a concentration of 1% is prepared, and added to the mixed powder 2 hours before the end of ball milling, and the powder after ball milling is dried With a 70-mesh sieve, dry-press the sieved powder to form a pressure of 200 MPa, and hold the pressure for 1 minute; place the formed sample in a microwave sintering furnace, turn on the vacuum pump, and put it into the furnace after the furnace is pumped to a vacuum state. Fill with nitrogen gas of 60KPa, then turn on the microwave power supply for heating, combined with figure 2 , heat the sample to 650°C at a speed of 50°C / min, heat to 1550°C at a heating rate of 20°C / min, keep at this temperature for 30 minutes, and then cool to room temperature with the fu...

Embodiment 2

[0026] combine figure 1 , a TiCN / Al of the present invention 2 o 3 Microwave preparation of cermet tool materials by mass percentage TiCN 45%, α-Al 2 o 3 15%, Mo 2 C 10%, WC 10%, Co and Ni 20% ingredients are mixed by ball milling, and a polyvinyl alcohol solution with a concentration of 5% is prepared, and added to the mixed powder 2 hours before the end of ball milling, and the powder after ball milling is dried 100-mesh sieve, dry-press the sieved powder, the pressure is 300MPa, and the holding time is 2min; put the formed sample in the microwave sintering furnace, turn on the vacuum pump, and after the furnace body is pumped to a vacuum state, put it into the furnace Fill with 40KPa nitrogen, then turn on the microwave power supply for heating, combined with figure 2 , heat the sample to 800°C at a speed of 80°C / min, heat to 1600°C at a heating rate of 50°C / min, keep at this temperature for 10 minutes, and then cool to room temperature with the furnace. After testin...

Embodiment 3

[0028] combine figure 1 , a TiCN / Al of the present invention 2 o 3Microwave preparation of cermet tool materials by mass percentage TiCN 50%, α-Al 2 o 3 12%, Mo 2 C 15%, WC 5%, Co and Ni 18% ingredients are mixed by ball milling, and a polyvinyl alcohol solution with a concentration of 7% is prepared, and added to the mixed powder 2 hours before the end of ball milling, and the powder after ball milling is dried 200-mesh sieve, dry-press the sieved powder to form, the pressure is 350MPa, and the holding time is 3min; put the formed sample in the microwave sintering furnace, turn on the vacuum pump, and after the furnace body is pumped to a vacuum state, put it into the furnace Fill with nitrogen gas of 60KPa, then turn on the microwave power supply for heating, combined with figure 2 , heat the sample to 800°C at a speed of 60°C / min, heat to 1550°C at a heating rate of 30°C / min, keep at this temperature for 20 minutes, and then cool to room temperature with the furnace. ...

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Abstract

The present invention discloses a TiCN / Al2O3 metal ceramic cutter and a microwave preparation process thereof, wherein the TiCN / Al2O3 metal ceramic cutter comprises, by weight, 40-60% of TiCN, 5-15% of alpha-Al2O3, 5-15% of Mo2C, 5-15% of WC, and 15-25% of No and Co. According to the present invention, the metal ceramic cutter adopts the 2.45 GHz frequency microwave dielectric as the heat source, and under the protection of the nitrogen atmosphere, the material ratio, the heating rate, the sintering temperature and other process parameters are optimized and the microwave sintering technology is used to prepare the metal ceramic cutter at the rapid heating rate; and the prepared metal ceramic cutter material has characteristics of high hardness and good toughness.

Description

technical field [0001] The invention belongs to the field of microwave sintering material science and technology, and relates to a TiCN / Al 2 o 3 Cermet knives and their microwave preparation technology. Background technique [0002] Compared with traditional high-speed steel cutting tools, WC-based cemented carbide cutting tools have been widely used in the field of metal processing due to their superior cutting performance and processing efficiency. However, the preparation of WC-based cemented carbide cutting tool materials requires the use of a large amount of tungsten ( W) resources. W is also a strategic and non-renewable resource that is necessary in the field of national defense and military industry. At the same time, the temperature at which WC begins to oxidize is about 600°C. In high-speed cutting, the temperature between the tool and the workpiece often reaches above 1000°C. At such a high temperature, the cutting of WC-based cemented carbide tools will be gre...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C30/00B22F3/10B22F1/00
Inventor 程寓胡瀚澎
Owner NANJING UNIV OF SCI & TECH
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