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
View PDF5 Cites 3 Cited by
  • 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 l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multicavity microwave sintering insulation device for ceramic tool
  • Multicavity microwave sintering insulation device for ceramic tool

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Sintering of alumina-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 aluminum silicate non-asbestos lids and mullite lids. 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, evacuate, and turn on the microwave switch for sintering. In the low temperature section, the temperature was raised to 800°C for 5 minutes at a rate of 20°C / min, and then heated to 1700°C at a constant rate of 30-40°C / min, kept for 10 minutes, and then cooled with the furnace. Alumina-based ceramic tool materials were obtained. The material densities obtained by the three cavities were 99.2±0.2%, 99.3±0.3% and 99.1±0.1%, respectively, which could meet the...

Example Embodiment

[0025] Example 2

[0026] Sintering of silicon nitride based ceramic tools. Three sintered samples of the same mass were placed in a crucible, placed in a buried powder composed of silicon carbide and boron nitride mixed powders, and covered with aluminum silicate non-asbestos lids and mullite lids. 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, evacuate, and turn on the microwave switch for sintering. At a rate of 30-40°C / min, the temperature was uniformly heated to 1800°C, maintained for 10 minutes, and then cooled with the furnace. A silicon nitride-based ceramic tool was obtained. The material densities of 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, fracture toughness is 7.3±0.2MPa ...

Example Embodiment

[0027] Example 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 aluminum silicate non-asbestos lids and mullite lids. 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, evacuate, and turn on the microwave switch for sintering. At a rate of 30-50°C / min, the temperature was uniformly heated to 1550°C, maintained for 10 minutes, and then cooled with the furnace. Titanium carbonitride-based ceramic tool materials are obtained, and the material densities obtained in the three cavities are 98.1±0.2%, 98.3±0.1% and 98.2±0.3%, respectively, which can meet the use requirements of tool materials. The whole sintering p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap