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Improved ceramic core firing method

A ceramic core and firing technology, applied in the field of investment precision casting, can solve problems such as long time, save energy, expand the scope of application, and shorten the firing cycle.

Inactive Publication Date: 2015-06-17
辽宁航安型芯科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problems, and mainly solve the technical problems such as the long time existing in the above-mentioned wax removal stage of the existing ceramic core and the easy occurrence of bulges, cracks, flow marks, etc., and provide a method that can shorten the firing time to Within 10 hours, the firing method can greatly improve the firing pass rate

Method used

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  • Improved ceramic core firing method

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Take and attach image 3 The green ceramic core body shown, put it in the drain basket, and then place the drain basket in the container containing n-heptane until the green ceramic core body is completely immersed in n-heptane, soak it at room temperature for 90 minutes Then take it out and dry the remaining liquid on the surface in a cool and ventilated place, then put it in a crucible and fill it with alumina powder around it, and then place the crucible on a shaking platform to shake it. Next, put the crucible into the ceramic core baking furnace and press figure 2 In the system shown for roasting, the heating rate in the wax removal stage is 3°C / min, the firing temperature is 1200°C, and the holding time is 2h. After the firing is completed, the furnace is cooled to 200°C, the furnace door is opened, and the furnace is cooled to below 60°C before leaving the kiln.

Embodiment 2

[0015] Take and attach Figure 4 The green ceramic core body shown, put it in the drain basket, and then place the drain basket in the container containing n-heptane until the green ceramic core body is completely immersed in n-heptane, refer to figure 2 After soaking at room temperature for 15 minutes, take it out, and dry the residual liquid on the surface in a cool and ventilated place, then put it in a crucible and fill it with alumina powder around it, and then place the crucible on a shaking platform to shake it. Next, put the crucible into the ceramic core baking furnace and press figure 2 In the shown system of roasting, the heating rate in the waxing stage is 3.3°C / min, the firing temperature is 1350°C, and the holding time is 3h. After the firing is completed, the furnace is cooled to 200°C, the furnace door is opened, and the furnace is cooled to below 60°C before leaving the kiln.

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Abstract

The invention discloses an improved ceramic core firing method. The technical problems of long time, high possibility of bulging, cracking and trace formation and the like of the conventional ceramic core in a wax removal stage are mainly solved. According to the method, n-heptane is used for dissolving and removing a part of a plasticizer in a ceramic core green body, and an open passage facilitating discharging of the plasticizer is formed on the premise of ensuring sufficient green body strength; in a later firing process, the plasticizer can be easily discharged from the formed open passage, so that the aims of shortening firing time and reducing the defects of a wax removal process are fulfilled; the firing cycle can be remarkably shortened, the firing time can be shortened to be within 10 hours, the firing qualified rate of the product can be increased, and the method has an important promotion effect on energy resource saving, cost reduction and expansion of the application range of the ceramic core.

Description

Technical field [0001] The invention belongs to the field of investment precision casting, and particularly relates to a firing method of a ceramic core for precision casting. Background technique [0002] In investment casting, the complicated and narrow inner cavity of the casting can not be implemented with conventional coating, sanding and other processes at all, and it must be formed with a prefabricated ceramic core. Ceramic cores are mainly used to form the cavity shape of complex parts. The ceramic core is made by mixing the selected matrix material, mineralizer and plasticizer under heating to form a uniform thermoplastic slurry, and then pressing it into a core according to the required shape and size in a certain way on special equipment Specimen or green parts. In order to make the formability of the slurry meet the technological requirements, the content of the plasticizer (the main components are paraffin, beeswax, polyethylene, etc.) in the ceramic core batching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/638C04B35/64
Inventor 程涛李建华张立健韩威
Owner 辽宁航安型芯科技股份有限公司
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