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Multicavity microwave sintering insulation device for ceramic tool

A technology of microwave sintering and ceramic knives, which is applied in the direction of furnaces, furnace types, lighting and heating equipment, etc., can solve the problems of low production efficiency of knives materials, too fast temperature loss of crucibles, etc., and achieve good interchangeability, fast heating rate, Avoid the effects of oxidation reactions

Inactive Publication Date: 2017-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the alumina fiber cotton is in direct contact with the crucible, the temperature of the crucible will be lost too quickly
And there is only one preparation cavity in this patent, the preparation efficiency of tool material is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Sintering of alumina-based ceramic knives. Three sintered samples of the same quality were placed in a crucible, placed in a buried powder composed of silicon carbide and graphite mixed powder, and covered with an aluminum silicate non-asbestos cover and a mullite cover. Place the heat preservation device in the cavity of the microwave sintering furnace, adjust the position so that the infrared rays emitted by the infrared thermometer hit the buried powder in the middle cavity, then close the furnace door, vacuumize, and turn on the microwave switch for sintering. The low temperature section is raised to 800°C at a speed of 20°C / min and kept for 5 minutes, then raised to 1700°C at a speed of 30-40°C / min, kept for 10 minutes, and then cooled with the furnace. Alumina-based ceramic tool materials were obtained, and the densities of the materials obtained by the three cavities were 99.2±0.2%, 99.3±0.3% and 99.1±0.1%, which can meet the requirements for the use of tool mate...

Embodiment 2

[0026] Sintering of silicon nitride based ceramic cutting tools. Three sintered samples of the same quality were placed in a crucible, placed in a buried powder composed of silicon carbide and boron nitride mixed powder, and covered with an aluminum silicate non-asbestos cover and a mullite cover. Place the heat preservation device in the cavity of the microwave sintering furnace, adjust the position so that the infrared rays emitted by the infrared thermometer hit the buried powder in the middle cavity, then close the furnace door, vacuumize, and turn on the microwave switch for sintering. At a speed of 30-40°C / min, the temperature is raised to 1800°C at a uniform speed, kept for 10 minutes, and then cooled with the furnace. A silicon nitride-based ceramic tool was obtained, and the densities of the materials obtained in the three cavities were 96.4±0.3%, 96.3±0.2% and 96.1±0.1%, respectively, and the Vickers hardness was 13.7±0.6GPa, 13.8±0.4GPa and 13.7±0.5GPa, the fractur...

Embodiment 3

[0028] Sintering of titanium carbonitride-based ceramic tools. Three sintered samples of the same quality were placed in a crucible, placed in a buried powder composed of silicon carbide and graphite mixed powder, and covered with an aluminum silicate non-asbestos cover and a mullite cover. Place the heat preservation device in the cavity of the microwave sintering furnace, adjust the position so that the infrared rays emitted by the infrared thermometer hit the buried powder in the middle cavity, then close the furnace door, vacuumize, and turn on the microwave switch for sintering. At a speed of 30-50°C / min, the temperature was raised to 1550°C at a uniform speed, kept for 10 minutes, and then cooled with the furnace. Titanium carbonitride-based ceramic tool materials were obtained, and the densities of the materials obtained in the three cavities were 98.1±0.2%, 98.3±0.1% and 98.2±0.3%, which can meet the requirements of tool materials. The entire sintering process Last fo...

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Abstract

The invention belongs to the technical field of manufacturing equipment of machining tools, and particularly relates to a multicavity microwave sintering insulation device for a ceramic tool. The device is provided with totally three or more cavities. Each cavity comprises an auxiliary heating part and a thermal insulation part. Each auxiliary heating part is formed by silicon carbide and graphite mixed powder or silicon carbide and boron nitride mixed powder. The thermal insulation parts are composed of a mullite box, aluminum oxide foam bricks, aluminum silicate non-asbestos, polycrystal mullite fiber cotton, an aluminum silicate non-asbestos cover and a mullite cover. Powder used for auxiliary heating can prevent material oxidization, and has the functions of low-temperature sintering assistance and high-temperature thermal insulation. In the sintering process, multiple samples can be prepared at the same time, temperature distribution is uniform, the temperature rise speed is high, and the highest temperature capable of being borne is 2,000 DEG C. The device is simple in structure, low in cost and beneficial to commercialization application, and the preparation efficiency and the mechanical property of a test piece can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of machining tool manufacturing equipment, in particular to a multi-cavity microwave sintering heat preservation device for ceramic tools. Background technique [0002] Because of its high hardness, high temperature resistance, oxidation resistance, strong corrosion resistance, good chemical stability, high wear resistance and resistance to metal bonding, ceramic tools have great applications in the field of high-speed cutting. At present, ceramic tools such as oxide ceramic tools (alumina-based) and non-oxidized ceramic tools (silicon nitride-based, carbide and titanium carbonitride-based ceramic tools) are mainly prepared by hot-press sintering or pressureless sintering, these methods exist The disadvantages of slow heating, high sintering temperature and expensive equipment are not conducive to the preparation and promotion of ceramic knives. Microwave sintering technology can realize rapid sintering of ...

Claims

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Application Information

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IPC IPC(8): F27B14/06F27B14/08F27B14/10F27B14/12F27B14/14
CPCF27B14/06F27B14/08F27B14/10F27B14/12F27B14/14F27B2014/0843F27B2014/104F27M2001/1508F27M2003/04
Inventor 程寓张勇
Owner NANJING UNIV OF SCI & TECH
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