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Composite ceramic mold core for water pump impeller and preparation method thereof

A technology of composite ceramics and water pump impeller, which is applied in the field of material processing engineering, can solve the problems of low surface finish and dimensional accuracy of impeller castings, low surface finish of cores, easy occurrence of cracks and fractures, etc., so as to improve the preparation and use performance. , The effect of simple manufacturing process and easy operation

Inactive Publication Date: 2011-06-15
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the cores used in the manufacture of water pump impellers were made of resin sand or oil sand. Although the manufacturing process is not complicated, the cores produced are prone to defects such as cracks and breaks due to their low strength at room temperature and high temperature. It is not high, and the surface finish of the core is not high due to the high particle size of the sand used, so the surface finish and dimensional accuracy of the obtained impeller casting are not high

Method used

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  • Composite ceramic mold core for water pump impeller and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Using 12 parts of silica sol (ω(SiO 2 =30% / Kg)) as the binding agent of the composite ceramic core coating, adopt 32 parts of 280 purpose high refractoriness refractory material powders (fused corundum: calcium carbonate=1: 0.1) as the composite ceramic core coating Basic materials, then add 2 parts of low-alkali glass fiber chopped strands with a length of 3 to 5mm, 15 parts of defoamer (such as ZF-100 type silicone defoamer), 1 part of disintegrating agent (edible glucose powder) and 1 part of Part grain refiner (cobalt aluminate and its oxide), the above components are uniformly dispersed, fully mixed and wetted, using a low-speed continuous mixer to stir the paint, and after 24 hours of uninterrupted stirring, the prepared The coating of the composite ceramic core is used for coating when making the core.

[0030] 2) A gelation method using dry hardening is adopted in the preparation process of the composite ceramic core. First, use the core mold to evenly appl...

Embodiment 2

[0033] 1) Using 13 parts of silica sol (ω(SiO 2 =30% / Kg)) as the binding agent of the composite ceramic core coating, adopt 34 parts of 340 purpose high refractoriness refractory material powders (fused corundum: calcium carbonate=1: 0.5) as the composite ceramic core coating Basic materials, then add 3 parts of low-alkali glass fiber chopped strands with a length of 3 to 5 mm, 16 parts of defoaming agent (n-octanol), 1.5 parts of disintegrating agent (edible glucose powder) and 1.5 parts of grain refiner ( Aluminate and its oxides), the above components are uniformly dispersed, fully mixed and wetted, using a low-speed continuous mixer to stir the coating, and after 24 hours of uninterrupted stirring, the coating for the composite ceramic core is prepared. Used for coating when making cores.

[0034] 2) A gelation method using dry hardening is adopted in the preparation process of the composite ceramic core. First, use the core mold to evenly apply the coating of the compos...

Embodiment 3

[0037] 1) Using 14 parts of silica sol (ω(SiO 2 =30% / Kg)) as the binding agent of composite ceramic core coating, adopt the refractory material powder (fused corundum: calcium carbonate=1: 1) of the high refractoriness of 36 parts of 400 purposes as the composite ceramic core coating Basic materials, then add 4 parts of low-alkali glass fiber chopped strands with a length of 3 to 5mm, 17 parts of defoamer (defoamer GP (ethylene glycol butyl ether phosphate)), 2 parts of disintegrator (edible glucose powder ) and 2 parts of grain refiner (nickel aluminate and its oxide), uniformly disperse the above components, fully mix and wet each other, use a low-speed continuous mixer to stir the coating, after 24 hours of uninterrupted stirring , Prepare the coating for the composite ceramic core for coating when making the core.

[0038] 2) A gelation method using dry hardening is adopted in the preparation process of the composite ceramic core. First, use the core mold to evenly apply...

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Abstract

The invention particularly relates to a composite ceramic mold core for a water pump impeller and a preparation method thereof, which belong to the technical field of material machining engineering. The composite ceramic mold core is characterized by comprising the following components in part by mass: 12 to 14 parts of silica sol in which the mass percent of SiO2 is 30 percent, 32 to 36 parts of 280 to 400-mesh refractory material powder, 2 to 4 parts of glass fiber chopped strand with the length of between 3 millimeter and 5 millimeters, 15 to 17 parts of antifoaming agent, 1 to 2 parts of breakdown agent and 1 to 2 parts of grain refiner, wherein the breakdown agent in the raw materials is edible glucose powder. The invention has the advantages that: 1) the stability of a coating is stable, and the high-temperature performance of a prepared mold shell is high; 2) casting defects such as sand holding and the like can be effectively avoided in an impeller casting process; 3) the preparation and service performance of the composite ceramic mold core can be effectively enhanced; 4) a manufacturing process of the mold core is easy, and is convenient to operate; and 5) the high-temperature performance of the mold core is high. After being baked, the composite ceramic mold core has the characteristic of water solubility, and can be removed by water.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a composite ceramic core for a water pump impeller and a manufacturing method thereof. Background technique [0002] The water pump impeller is an important part in the water pump machinery, and its internal complex structure is cast by placing a core in the mold. In the past, the cores used in the manufacture of water pump impellers were made of resin sand or oil sand. Although the manufacturing process is not complicated, the cores produced are prone to defects such as cracks and breaks due to their low strength at room temperature and high temperature. The surface finish of the core is not high due to the high particle size of the sand used, so the surface finish and dimensional accuracy of the obtained impeller casting are not high. Contents of the invention [0003] The object of the present invention is to provide a composite ceramic c...

Claims

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Application Information

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IPC IPC(8): C04B35/101C04B35/622
Inventor 张勇王超
Owner SHANDONG UNIV OF TECH
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