High-hardness anti-cracking mica powder modified silica matrix EPC coating and preparation method thereof

Abstract

The invention discloses a high-hardness anti-cracking mica powder modified silica matrix EPC coating. The high-hardness anti-cracking mica powder modified silica matrix EPC coating is prepared from the following raw materials in parts by weight: 100-102 parts of silica powder, 0.9-1.1 parts of modified starch, 0.9-1.1 parts of carboxymethyl cellulose, 2.4-2.6 parts of sodium bentonite, 0.9-1 part of mica powder, 0.8-0.9 part of tetrapod-shaped ZnO whiskers, 0.9-1.1 parts of silica sol, 10-13 parts of ethyl alcohol, an appropriate amount of water, 0.8-1 part of lamellar niobium pentoxide, 2-2.5 parts of graphite foam and 2-2.5 parts of nanometer aluminum oxide. According to the high-hardness anti-cracking mica powder modified silica matrix EPC coating, by utilizing the lamellar niobium pentoxide and the graphite foam, passages can be provided for gas emission during casting, so that cast blebs are reduced; meanwhile, spatial interveined arrangement is formed by the composition, and a stable structure is formed, so that the hardness and bending strength of the coating are improved; and furthermore, the heat dissipation performance of the lamellar niobium pentoxide, the graphite foam and the nanometer aluminum oxide is good, so that the phenomenon of partial cracking of the coating caused by sudden heating is reduced.

Description

technical field [0001] The invention relates to the technical field of lost foam coatings, in particular to a high-hardness anti-cracking mica powder modified quartz-based lost foam coating and a preparation method thereof. Background technique [0002] Lost foam casting is a casting technology with almost no margin, and coating is the key point of lost foam casting. The performance of coating is directly related to the quality of castings. Lost foam coatings generally consist of refractory aggregates, binders, suspending agents, carriers, and additives. As a cheap and easy-to-obtain refractory aggregate, quartz powder is widely used in lost foam casting, but its application is limited due to its poor sintering performance. The principle of the lost foam coating at the beginning of the design is to sinter and peel off. If the sintering performance of the refractory aggregate is poor at the pouring temperature, a sufficient amount of liquid phase cannot be formed. Then the...

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Problems solved by technology

[0003] However, the poor dispersion and suspension of mica in the coating can easily lead to uneven flexural strength after sintering and uneven peeling performance, and the mica becomes flakes, which will block the pores, affect the gas discharge, and cause the pores of the casting, which needs to be improved.