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Thermal insulation and auxiliary heating device for microwave sintering of ceramic cutter material

A technology of auxiliary heating and ceramic knives, which is applied in lighting and heating equipment, furnaces, charging support, etc., can solve the problems of affecting the heat preservation effect of the sintering process, affecting the sintering performance of materials, and not providing heating heat sources, so as to avoid heat loss, Good interchangeability, anti-oxidation effect

Inactive Publication Date: 2015-11-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unreasonable heat preservation device design will affect the heat preservation effect during the sintering process, resulting in serious heat loss and lower heating rate during the sintering process, which in turn affects the sintering performance of the material
[0003] There are mainly two types of heat preservation devices currently disclosed for microwave sintering. One is that it only plays a role in heat preservation. In the middle, it will cause the temperature rise rate of the low-temperature section of the material to be extremely slow; the other is to place a silicon carbide rod with good wave absorption around the sintered sample (such as a heat preservation device mentioned in the invention patent with the patent application publication number CN102432303A), Although this device can provide an additional heat source during sintering, for the sintering of ceramic tool materials, this auxiliary heating method has poor thermal insulation effect, rapid heat loss, slow heating rate, and excessive temperature difference when cooling down, which is easy to Caused the sintered sample to bear a large thermal stress and cracked

Method used

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  • Thermal insulation and auxiliary heating device for microwave sintering of ceramic cutter material
  • Thermal insulation and auxiliary heating device for microwave sintering of ceramic cutter material
  • Thermal insulation and auxiliary heating device for microwave sintering of ceramic cutter material

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Effect test

Embodiment 1

[0030] Sintering of alumina-based ceramic materials. The sample to be sintered is placed inside the crucible and the crucible is completely filled with micron-sized silicon carbide, graphite and activated carbon mixed powder, and the alumina fiber cotton cover and mullite cover are sequentially covered. Put the device into the cavity of the microwave oven, adjust the relative position of the infrared in the thermometer and the green body, and ensure that the infrared can enter the auxiliary heating area through the probe hole, then close the oven door, and turn on the microwave power switch to figure 2 The schematic diagram of the sintering process curve shown in the figure shows that the sintering is completed. The temperature of the sintered sample reaches 1800°C in about 50 minutes, and then it is kept for 10 minutes. The whole sintering process lasts about 60 minutes. After the sintering is completed, it is cooled to room temperature with the furnace. The relative density...

Embodiment 2

[0032] Sintering of titanium carbonitride-based ceramic tool materials. The sample to be sintered is placed inside the crucible and the crucible is completely filled with micron-sized silicon carbide, graphite and activated carbon mixed powder, and the alumina fiber cotton cover and mullite cover are sequentially covered. Put the device into the cavity of the microwave oven, adjust the relative position of the infrared in the thermometer and the green body, and ensure that the infrared can enter the auxiliary heating area through the probe hole, then close the oven door, and turn on the microwave power switch to image 3 The schematic diagram of the sintering process curve shown in the figure shows that the sintering is completed, and the temperature of the sintered sample reaches 1550°C in about 30 minutes, and then it is kept for 10 minutes. The whole sintering process lasts about 40 minutes. After the sintering is completed, it is cooled to room temperature with the furnace....

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Abstract

The invention discloses a thermal insulation and auxiliary heating device for microwave sintering of ceramic cutter material. The device comprises a thermal insulation area which is formed by an outer-layer mullite box, high temperature resistant aluminum oxide fiber cotton and high temperature resistant aluminum oxide foam bricks, and an auxiliary heating area which is formed by silicon carbide, graphite and activated carbon powder. The device can bear the sintering temperature of almost 2000 DEG C during the sintering process, and the thermal insulation effect is excellent. The added graphite and the activated carbon powder can increase the carbon potential in a material sintering system, so as to prevent material oxidation and ensure material quality. By the reasonable arrangement of the auxiliary heating area, test pieces of different shapes and sizes can be formed in a single sintering process. The device has features of simple structure, good compatibility, safe and convenient use, good thermal insulation effect, short heating time, low cost, and easy commercialization.

Description

technical field [0001] The invention belongs to the technical field of microwave sintering, in particular to a thermal insulation and auxiliary heating device for microwave sintered ceramic tool materials. Background technique [0002] Oxide ceramics (such as Al 2 o 3 base, etc.) and non-oxide ceramics (such as Si 3 N 4 base, TiCN base, etc.) are widely used in the preparation of cutting tools in metal material processing because of their excellent comprehensive mechanical properties. The traditional methods for preparing the above-mentioned ceramic materials mainly include hot-press sintering and vacuum pressureless sintering. However, since the heating process of these methods is in the form of traditional heat conduction and heat radiation, the energy loss in the heating process is relatively large, and the operating cost of the equipment is also relatively high. Compared with traditional heating methods, microwave sintering technology can realize rapid sintering of ...

Claims

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Application Information

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IPC IPC(8): F27D5/00
Inventor 程寓胡瀚澎
Owner NANJING UNIV OF SCI & TECH
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