Sialon complex phase ceramic lift tube and production method thereof

Abstract

The invention relates to a sialon composite ceramic lift tube and a preparation method thereof. The weight percents of the raw materials forming the composite ceramic lift tube are: 25-50 percent of silicon nitride, 15-30 percent of quartz, 5-20 percent of aluminum dioxide, 0.01-0.1 percent of yttria, 20-40 percent of carborundum, 1-10 percent of zirconia, 0.01-0.06 percent of acrylamide, 0.001-0.005 percent of N, N'-methylenebisacrylamide, 0.1-0.7 percent of polymethacrylic acid amine and 0.05-0.2 percent of ammonium persulfate. The preparation method comprises: adding pre-mix liquid to a ball mill in advance, adding the silicon nitride, the quartz, the yttria, the aluminum dioxide, the carborundum and zirconia in sequence and ball-milling for 15-30 hours; adding the ammonium persulfate to the sizing agent, vacuumizing by a vacuum agitator and injecting into a mold to be solidified; demolding, drying and sintering at the temperature of 1300-1600 DEG C to obtain the finished product. The sialon composite ceramic lift tube is characterized by long service life, high strength, strong thermal shock resistance and low cost, which is not infiltrated or reacted with aluminum melt.

Description

Technical field: [0001] The present invention relates to the field of liquid riser ceramic materials and preparation methods, in particular to a Sailong composite ceramic liquid riser (also known as Sailong complex phase ceramic liquid riser) and a preparation method, and its products are mainly used in the production of vehicles with high quality and safety Key components on low-pressure casting machines for structural parts (such as hubs, running parts, etc.) and engine structural parts (especially parts for automobiles and motorcycles). Background technique: [0002] In the 1960s, with the introduction of the concept of ceramic engines, countries around the world researched and developed new ceramic materials, and a large number of high-performance structural ceramic materials emerged, which are widely used in civil and industrial industries such as metallurgy, chemical industry, automobiles, and aerospace. and military fields. With the development of the automobile indu...

AI Technical Summary

Problems solved by technology

At present, most of the risers in China are quartz riser tubes and aluminum titanate riser tubes. Due to their own materials, the riser tubes of these two types of materials are easy to crystallize or undergo oxidation-reduction reactions with aluminum solutions at high temperatures, thus As a result, the online service life is only more than ten days, and the longest is only more than one month

For a long time, domestic research on liquid risers has focused on how to improve the performance and service life of aluminum titanate, and for the development of other high-performance materials, there are only a few domestic research institutes conducting research, such as the development of Northwestern Polytechnical University. The reaction sintered silicon nitride combined with silicon carbide riser has made some progress, but has not yet been mass-produced