First, color.
Black, white, red, yellow, etc.
Second, the main raw materials
Special diatomite removes 5-8% of bound water, organic matter and impurities in diatomite; Alumina, silicon dioxide. ; Casting coating suspending agent (lithium-based attapulgite, organic clay, etc.). ).
Third, the scope of use
Metal mold surface, iron contact/aluminum contact/copper contact;
Fourth, function
1, ZD coating can insulate heat, balance temperature and avoid the impact and corrosiveness of molten metal, thus protecting tools and prolonging their service life by more than 1/3;
2. Prevent the casting from cracking and forming white spots due to excessive local cooling;
3, the adsorption time is as long as 7 days, and the air permeability is good. Acetylene smoke treatment can be used instead of using release agent every time, and a casting can be smoked once;
Verb (abbreviation of verb) advantage
1. Compared with phosphating film, its unique physical properties determine its advantages;
2. Good ventilation;
3. The heat preservation effect is obvious, and the melting point is above 1650℃;
4. After spraying, it has strong adhesion and is not suitable for peeling. Generally, it needs to be repaired after one week. ZD coating does not need to be sprayed every time it is opened like other coatings, which saves the tedious work of disassembling tools every day because of spraying coating;
5, the price is relatively low, which greatly reduces the expensive production and casting costs caused by the use of alcohol-based coatings or imported coatings;
6. Greatly improve the production efficiency.
Suggested usage of intransitive verbs
100g coating powder+100g neutral sodium silicate +300g water, pour it into a small soymilk machine and mix it evenly, then pour it into a spray gun and spray it on the surface of a hot (200-300℃) metal mold with a thickness of 0.2mm, and spray it on local thin parts with a thickness of 0.3-0.4mm according to product requirements, and then dry it. It can be sprayed for about 20 minutes. If there is any discrepancy, the manufacturer's requirements shall prevail!
Seven, alcohol-based casting coating advantages:
1. After painting and ignition, the coating on the surface of the mold and core can be dried by itself without entering the drying kiln;
2, convenient use and short production cycle;
3. The model and core of sodium silicate sand can be applied.
Eight, the casting is stuck to sand because the coating does not play an effective role in blocking and isolating, or the coating reacts chemically with high-temperature metal liquid.
1. Poor adhesion of coating: sand-filling vibration causes coating to peel off, resulting in sand sticking of castings.
2. The coating has a large expansion coefficient: when it comes into contact with high-temperature metal liquid, the coating leaves the mold due to the expansion of the heated volume, causing the casting to stick to sand.
3. High-temperature liquid metal is oxidized and chemically reacts with coating and mold to generate metal oxide, which has strong adhesion to both coating and molding sand, and can make molding sand firmly adhere to the surface of the casting, forming a series of low-melting-point compounds (there are many low-melting-point substances in the thick wall and corner of the casting, and the sand layer is worse), resulting in sand sticking to the casting. Sometimes, although there is no sand sticking, a layer of paint that is difficult to remove will be attached to the surface of the casting, resulting in sticky ash.
How did you read the related introduction of casting coatings in Bian Xiao? Do you have a certain understanding of the related contents of casting coatings? I hope these introductions will help you and create a more perfect home environment. Ok, that's all for today's introduction. Thank you for reading this article, and for your strong support and love for Bian Xiao. Want to get more information about home improvement, please continue to pay attention.