Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof

Abstract

The invention relates to a covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof. The covering agent consists of the following components in percentage by weight: 40 to 70 percent of cryolite, 2 to 10 percent of phosphor copper master alloy and the balance of charcoal ash, wherein the summation of the percentage by weight of each component is 100 percent. When the covering agent is applied to the vertical semi-continuous casting of the aluminum bronze, a 'thin covering' technique is adopted, namely a round porous mesh screen is fixed on a crystallizer, the cover agent is placed in the mesh screen, and during casting, along with the vibration of the crystallizer, the powdered covering agent in the mesh screen is uniformly scattered on the surface of a fused mass, and the covering thickness is only 0.5 to 2 mm. The covering agent not only can reduce the defects of slug inclusion on an ingot casting surface layer, gas holes, cold shut and the like, but also can reduce the depth of the slug inclusion in an ingot, so the ingot surface quality is high, the finished product rate is improved by 10 to 40 percent, and the ingot has high mechanical properties. When applied to the casting of the aluminum bronze, the covering agent can also improve the production efficiency of casting of the aluminum bronze by 15 to 35 percent, and prolong the service life of the crystallizer by 50 to 80 percent. The covering agent is simple and convenient to prepare, has a low use cost, and is simple for production operation.

Description

technical field [0001] The invention belongs to the field of new materials. The invention relates to a covering agent for vertical semi-continuous casting of aluminum bronze and its application. Background technique [0002] Aluminum bronze is a high-strength structural material widely used in machinery manufacturing. It is widely used in the manufacture of various high-strength wear-resistant parts because of its excellent mechanical properties, wear resistance, and corrosion resistance. It plays an important role in both civil and military fields. role. [0003] Due to the relatively high amount of aluminum contained in aluminum bronze, the oxidation tendency is very serious, and it is easy to get gas and oxidize to form Al in the process of melting and casting. 2 o 3 . Complete dense Al 2 o 3 The thin film can prevent the copper liquid from continuing to oxidize, but the stirring of the melt during the smelting process, the vibration of the crystallizer, and the rol...

AI Technical Summary

Problems solved by technology

Compared with carbon black, cryolite or mixed salt is used as a covering agent in the casting process, which can not only prevent the melt from contacting with air, but also prevent the formed block Al 2 o 3 Melting prevents it from flowing into the inner surface of the crystallizer, but the amount of covering agent added is difficult to control

When a large amount is added, the part that is not in direct contact with the melt is likely to become impurities and be involved in the gap between the crystallizer and the ingot, resulting in slag inclusion, and a small amount of covering agent cannot exert the best covering effect