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Restoring method of graphite inner container of pressure sintering furnace

A technology of pressure sintering and repairing methods, which is applied in the direction of furnaces, furnace components, lighting and heating equipment, etc. It can solve problems affecting product quality, product dewaxing and carburizing, and long maintenance cycles to achieve accurate drying temperature and time, The effect of shortening equipment maintenance time and reducing the difficulty of repair

Active Publication Date: 2014-02-26
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the pressure sintering furnace is a kind of high-temperature and high-pressure working equipment, the graphite liner of the pressure sintering furnace has to undergo a rapid temperature rise, rapid cooling, and the process from low pressure to high pressure and then to low pressure during each working process, causing the graphite liner to experience rapid expansion and Due to the shrinkage process, as the number of times of use increases, the adhesive glue of the graphite liner will peel off, and holes will appear on the bonding end surface. Hydrogen gas will enter the furnace from this crack, resulting in insufficient hydrogen at the rear end of the furnace, and insufficient dewaxing of products at the rear end of the furnace. Complete carburization occurs, affecting product quality
Use graphite glue to repair the graphite liner of the pressure sintering furnace. During use, graphite glue foaming, cracking at high temperature, and loose bonding often occur during use, and it is almost impossible to use normally.
Therefore, the prior art solution to the above-mentioned problems is to replace the graphite liner of the pressure sintering furnace, because the quality of the graphite liner of the pressure sintering furnace made in China is far from that of the same foreign product, and foreign purchases require more than 3 months of purchase Period, and the cost is expensive, so the maintenance cycle is long and the maintenance cost is high, which increases the product cost and affects production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 Remove the adhesive glue at the junction of the graphite liner of the pressure sintering furnace, cut a 5×5mm groove with a depth of 4mm at the edge, polish the groove with sandpaper, and clean it thoroughly with analytical ethanol; mix 70% ( Mass percentage, hereinafter the same) graphite glue and 30% carbon fiber are mixed thoroughly, mixed with methanol and mixed thoroughly to form an adhesive, repair the above-mentioned cleaned graphite inner liner of the pressure sintering furnace, dry, and cool under an argon environment greater than 0.5MPa; Polish and clean the repaired part of the graphite liner of the above-mentioned pressure sintering furnace, mix thoroughly with graphite glue and ethanol, and then repair the above-mentioned repaired part for the second time. When drying, use vacuum drying, heat up to 80 ° C at a uniform speed for 0.5 hours, and keep warm for 1.5 Hour. After drying, it is calcined at 1400°C, kept for 1 hour during calcination, and co...

Embodiment 2

[0013] Embodiment 2 The difference from Example 1 is that the sandpaper adopts 120 mesh sandpaper, and the adhesive used for repairing for the first time is to mix thoroughly with 65% graphite glue and 35% carbon fiber, then use 15% methanol by weight of graphite glue Mix and mix thoroughly derived. The adhesive used for the second repair is obtained by mixing thoroughly with 70% graphite glue and 30% ethanol. During drying, the temperature was raised to 120°C at a constant speed for 1 hour, and the temperature was kept for 1 hour. The calcination temperature is 1600°C, and the holding time is 0.5 hours. The repaired pressure sintering furnace graphite liner, the use data shows that it can be used continuously for more than 800 times.

Embodiment 3

[0014] Embodiment 3 The difference from Example 1 is that the sandpaper adopts 240 mesh sandpaper, and the adhesive used for repairing for the first time is to mix thoroughly with 60% graphite glue and 40% carbon fiber, then use 20% methanol by weight of graphite glue Made by mixing. The adhesive used for the second repair is obtained by mixing thoroughly with 73% graphite glue and 27% ethanol. During drying, the temperature was raised to 150°C at a constant speed for 1.5 hours, kept at a temperature of 0.5 hours, and the vacuum degree was kept greater than 2mbar. During calcination, the temperature was raised to 1500°C in 4 hours, and the holding time was 2.5 hours. The repaired pressure sintering furnace graphite liner, the use data shows that it can be used normally and continuously for more than 1000 times.

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PUM

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Abstract

The invention discloses a restoring method of a graphite inner container of a pressure sintering furnace. The restoring method comprises the following steps of: deaging adhesive glue at the middle joint of the graphite inner container of the pressure sintering furnace, chamfering the edge of the graphite inner container, cleaning the graphite inner container, uniformly mixing graphite glue and carbon fiber according to a certain proportion, then adding methanol to prepare a bonding agent, repairing the graphite inner container, drying, polishing and cleaning a repaired part, and preparing a bonding agent by using the graphite glue and ethanol for secondary repairing. Compared with the prior art, the restoring method adjusts the bonding agents to enable the joint of the graphite inner container to be tighter in bonding and more resistant to high temperature and high pressure, and own equipment is utilized for drying so as to more accurately control the drying temperature and time. The restoring method is simple and convenient in operation and low in cost, greatly shortens the equipment maintenance time, and reduces the loss caused by the equipment maintenance.

Description

technical field [0001] The invention relates to a method for repairing graphite materials, in particular to a method for repairing graphite liners of pressure sintering furnaces. Background technique [0002] At present, there are mainly two specifications of graphite liner for pressure sintering furnace: 1800mm×Ф860mm and 2700mm×Ф860mm. The graphite liner of the pressure sintering furnace is made of high-density and high-purity graphite material. The current technology cannot meet the requirements of one-time molding of the graphite liner of the pressure sintering furnace. body bonded. Since the pressure sintering furnace is a high-temperature and high-pressure working equipment, the graphite liner of the pressure sintering furnace has to undergo a rapid temperature rise, rapid cooling, and a process from low pressure to high pressure and then to low pressure during each working process, resulting in rapid expansion and expansion of the graphite liner. Due to the shrinkag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/00
Inventor 姜配其李远陈忠华王绍洲
Owner ZHUZHOU HARD ALLOY GRP CO LTD