Air Hole Of Fused Cast AZS Brick
2015-12-15
Fused cast AZS brick is made by casting method, and air holes are caused during casting operation, generally, there are three kinds of air holes caused by casting.
1. Vacant shell
When the casting is rapid, exhaust is poor, then top corner on the fused cast azs brick will form air bags, after solidification, vacant shell is formed. In order to prevent the formation of vacant shell, except for the time limiting of casting operation, the thickness of the pouring stream is also required, usually pouring fast at first, then slow down.
2. Foam layer
If the heat insulating material fall into the casting mold, it will react with the glass liquid, form a form layer and float on the on the liquid surface which will float up to the top of the cavity, after solidification, form layer is formed on the surface of casting mouth, so keep and check the cavity clean is needed before casting.
3. Pin hole
The pin hole often occurs in the first fused cast AZS brick of casting, because the furnace mouth area is not clean, raw material or spout oxide powder are mixing in it which is poured into the mold after the rapid reaction with the molten liquid, due to the high viscosity of the melt, these bubbles can not be broke, and they are left in the molten liquid. So keep the molten liquid channel clean can also not be ignored.
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