Manufacturing method of silicon carbide product for centrifugal pump
A manufacturing method and technology of silicon carbide, which is applied to the flow-through part of silicon carbide material and the field of product manufacturing, can solve the problems of processing difficulties, product difficulties, high scrap rate, etc., and achieve the goal of solving technical bottlenecks and reducing manufacturing costs Effect
Active Publication Date: 2014-08-06
YIXING LINGGU PLASTIC EQUIP
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Problems solved by technology
This method has two major disadvantages: First, the scrap rate is high, because the controllability of the sintering process is low, and it is prone to various unpredictable defects, such as product cracking, deformation, etc., which can only be scrapped, which not only wastes the product itself , It also wastes the previous processing technology; second, the processing is difficult, because the hardness of the sintered product is very high, and the general gold processing tool is not competent, so the processing cost is extremely high, and it is even more difficult for products with complex shapes
Overall, this manufacturing process is very inefficient and the cost of the finished product remains high
This defect is especially prominent on large-sized products (higher sintering reject rate), which makes large-sized products unable to be mass-produced
Method used
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Embodiment Construction
[0016] The complete flow of an embodiment is listed below to illustrate the technical content of the present invention. This embodiment is to manufacture a lining part of a centrifugal pump, including an impeller and a combined flow chamber, wherein the impeller is an integral part, and the combined flow chamber is composed of multiple parts for easy processing.
[0017] 1. Configure pressed powder
[0018] The ingredients of the powder and the preferred ratio are as follows: W14 silicon carbide powder 55%, W10 silicon carbide powder 18%, phenolic (2123 resin) 19%, propylene glycol 0.5%, 70 mesh petroleum coke 4%, and the rest is polyurethane polymerizer. Put the above materials into the spray granulation tower and mix thoroughly to form a mixture.
[0019] In the second embodiment, the following proportions can also be used: W14 silicon carbide powder 52%, W10 silicon carbide powder 18%, phenolic (2123 resin) 20%, propylene glycol 0.3%, polyurethane polymerizing agent 5%, an...
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The invention discloses a manufacturing method of a silicon carbide product for a centrifugal pump. The manufacturing method comprises the following steps of: firstly, preparing a compaction powder material, wherein the powder material comprises 70-85 percent of silicon carbide micro-powder, and 1-5 percent of phenolic aldehyde and polyurethane polymerizing agent; putting the fully-mixed powder material into a mould and compacting by virtue of a compaction machine to form a mould pressing blank piece; drying the mould pressing blank piece in the shade to eliminate the stress; pre-burning the mould pressing blank piece in a vacuum mode and cooling; performing accurate size processing; and finally, preparing a free silicon reactant, putting the free silicon reactant above the pre-burned blank piece, and sintering by using process methods of reaction sintering and six-section sintering. By using the method, the defects of low finished product rate, incapability of carrying out size processing of products and complicated shapes in the prior art are overcome, and the silicon carbide product is manufactured to be the centrifugal pump, so that the service life is long, and the production cost is low.
Description
technical field [0001] The present invention relates to the manufacture of a silicon carbide product, in particular to a method for manufacturing the flow-through part made of silicon carbide used in a centrifugal pump, that is, a product called a liner. Background technique [0002] A centrifugal pump is a device that uses the impeller to rotate in the cavity of the pump body to generate centrifugal force to transport liquid. Due to the high-speed rotation of the impeller, the driven liquid will wear the cavity and the impeller itself, which will affect the service life of the pump, especially the slurry pump, which works in an environment with a very high sediment content, and the sand will wear the pump very strongly. Under harsh conditions, it can only be used for hundreds of hours and then it will be scrapped. [0003] For this reason, various high-hardness materials are used to manufacture the flow-passing parts of the pump, such as stainless steel, high-strength plas...
Claims
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IPC IPC(8): C04B35/622C04B35/565F04D7/04
Inventor 陈伯生高孟平
Owner YIXING LINGGU PLASTIC EQUIP