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Combined filler for ceramic core sintering and application method of combined filler

A technology of combining fillers and ceramic cores, applied in cores, casting molds, casting molding equipment, etc., can solve the problems of product waste, sintering deformation, etc., and achieve the effect of improving product qualification rate and reducing fracture

Active Publication Date: 2018-03-23
SHENYANG MINGHE QUARTZ PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a composite filler for ceramic core sintering and its application method, which can effectively improve the qualified rate of ceramic core sintering, especially for ceramic cores with large size and complex structure, and thoroughly Solve the problem of product waste caused by sintering deformation and broken core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The ceramic core sintering composite filler of the present embodiment is made up of the raw material of following percentage by weight: 150 purpose industrial alumina powder 35%, alumina ceramic fiber powder 20% (Na 2 O and K 2 The total content of O is less than 0.28%), and the chopped alumina ceramic fiber with a length of 2 cm and a diameter of 20 μm is 45%.

[0013] Mix the above raw materials with a V-shaped mixer; first fill the sagger of the heating furnace with a third of the combined filler, insert the ceramic core to be sintered into the combined filler of the sagger, and then use the combined filler to fill the sagger Fill it up and vibrate the sagger to ensure that the combined filler completely covers the ceramic core, then put it into a heating furnace for sintering, cool with the furnace after sintering, take out the ceramic core, the surface is less sticky sand, and the pass rate is over 90%.

Embodiment 2

[0015] The ceramic core sintering composite filler of the present embodiment is made up of the raw material of following percentage by weight: 200 mesh mullite powder 22%, mullite ceramic fiber powder 28% (Na 2 O and K 2 The total content of O is less than 0.28%), 50% of chopped alumina ceramic fibers with a length of 5 cm and a diameter of 50 μm.

[0016] Mix the above raw materials with a V-shaped mixer; first fill the sagger of the heating furnace with a third of the combined filler, insert the ceramic core to be sintered into the combined filler of the sagger, and then use the combined filler to fill the sagger Fill it up and vibrate the sagger to ensure that the combined filler completely covers the ceramic core, then put it into a heating furnace for sintering, cool with the furnace after sintering, take out the ceramic core, the surface is less sticky sand, and the pass rate is over 90%.

Embodiment 3

[0018] The ceramic core sintering composite filler of the present embodiment is made up of the raw material of following percentage by weight: 20% of 200 mesh zirconia powders, 20% of zirconia ceramic fiber powders (Na 2 O and K 2 The total content of O is less than 0.28%), and the chopped alumina ceramic fiber with a length of 8 cm and a diameter of 100 μm is 60%.

[0019] Mix the above raw materials with a V-shaped mixer; first fill the sagger of the heating furnace with a third of the combined filler, insert the ceramic core to be sintered into the combined filler of the sagger, and then use the combined filler to fill the sagger Fill it up and vibrate the sagger to ensure that the combined filler completely covers the ceramic core, then put it into a heating furnace for sintering, cool with the furnace after sintering, take out the ceramic core, the surface is less sticky sand, and the pass rate is over 90%.

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Abstract

The invention provides a combined filler for ceramic core sintering and an application method of the combined filler. The combined filler is composed of, by weight percentage, 20-50% of metal oxide powder, 15-28% of ceramic fiber powder and 30-65% of short-cut ceramic fiber. The application method for the combined filler comprises the following steps that the materials are prepared according to the weight percentage matching of the combined filler, all the raw materials are uniformly mixed, and the combined filler is obtained; a ceramic core to be sintered is filled with the combined filler; the ceramic core filled with the combined filler is sintered; and the ceramic core is taken out after sintering is completed. By the adoption of the combined filler and the application method, breakagecaused by deformation and gravity of the ceramic core can be reduced greatly, and the product percent of pass is greatly increased to over 90%.

Description

technical field [0001] The invention belongs to the technical field of manufacturing and producing ceramic cores, and in particular relates to a combined filler for sintering ceramic cores and an application method thereof. Background technique [0002] With the continuous improvement of the performance of aero-engines and industrial gas turbines, the precision requirements for high-temperature-resistant blades and complex structural castings are also increasing. Usually, it is necessary to use ceramic cores to prepare hollow structures, and in the sintering process of ceramic cores , In the dewaxing stage and sintering stage, the way of filling is often used, which requires the filler to have excellent wax removal performance, especially for the supporting role of the core with large size and complex structure. However, in the production process of ceramic cores, the fillers currently used are pure alumina and other fine powders, which are prone to defects such as sand stic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00C04B35/64
CPCB22C1/00C04B35/64
Inventor 梁康硕刘枫
Owner SHENYANG MINGHE QUARTZ PROD
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