A kind of manufacturing method of composite ceramic closed impeller containing metal skeleton

Abstract

The invention discloses a manufacturing method of a composite ceramic closed impeller containing a metal framework, and belongs to the field of application of impeller wear-resistant protective coatings. The manufacturing method comprises the first step of preparation of an impeller framework, the second step of preparation of an outer diameter mold and a foaming core mold, the third step of impeller mold combining and assembling operation, the fourth step of pouring equipment connection, the fifth step of pouring material preparation, the sixth step of pouring material vacuumizing operation,the seventh step of material pouring, the eighth step of pouring material curing operation, the ninth step of mold disassembling operation and the tenth step of detail polishing operation. The vacuumizing step is carried out in the pouring material mixing process, and entrained bubbles in the pouring materials are removed before the material pouring. The two sections of processes of heating and curing are carried out after material pouring is finished, the operation difficulty of the material pouring process is reduced, waste material cleaning work is convenient, the personnel shift of the production section can be reasonably arranged, and the manufacturing method has the comprehensive advantages of simple design, stability, reliability, excellent quality and cost economy.

Description

technical field [0001] The invention relates to a method for manufacturing a metal skeleton-containing composite ceramic closed impeller in the field of impeller wear-resistant protective coating application. Background technique [0002] In order to improve the wear resistance of the impeller in the application process, sintered ceramic powder is used in the market to solidify and form, and the ceramic powder is melted at a temperature above 1000 degrees Celsius and poured into a mold for sintering to prepare a ceramic impeller. However, the formed ceramic impeller is easy to be brittle, and it is very easy to crack and disintegrate under the high-speed operation of the water pump. At the same time, due to the limitation of high-temperature sintering, the metal is easy to melt, so the impeller is made of ceramics as a whole, and the method of lining the metal skeleton cannot be used to disperse the stress. In order to ensure the working strength of the impeller, a composit...

AI Technical Summary

Problems solved by technology

"Metal mandrels" are expensive to process and maintain, and are prone to wear and localized damage at the tip and thin layers after multiple installations and removals

The surface of the "gypsum core mold" is porous and rough, and it is easy to dry and crack, resulting in rough finished impellers after demoulding

The "wax mandrel" is relatively fragile, and its structural strength is not enough, so it cannot be used for the installation and fixing of large mandrels, and it becomes soft and collapses during the curing process after heating

[0003] Invention patent CN201620798889.7 introduces a resin-lined silicon carbide desulfurization pump. The pouring riser on the mold is on the top, and pouring from top to bottom will inevitably cause air to be entrained into the mold cavity, resulting in the bottom and corners containing Air bubbles, affecting the quality of finished products

However, the production of large vacuum chambers is expensive, and the cost of pouring and mass production of large impellers is huge

In addition, when pouring in a vacuum chamber, due to the high viscosity of the composite ceramic material itself, it is easy to cause the pouring material to fail to flow to the narrow channel at the bottom of the mold, and the pouring material stops flowing due to high resistance, or intermittent voids appear in the pouring material , so that the cured finished product is scrapped, which reduces the quality of the finished product and increases the cost

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