Rare earth coated and magnesium oxide based ceramic core
A magnesia-based ceramic and rare earth coating technology, applied in the direction of core, casting mold, casting mold composition, etc., can solve problems such as core collapse, avoid thermal cracking, simple core removal equipment, and reduce costs.
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[0027] A rare earth-coated magnesia-based ceramic core, which is composed of the following raw materials in weight percentage:
[0028] 10wt% mineralizer, 17wt% plasticizer, 1.5wt% polyethylene powder, and the rest is rare earth-coated magnesium oxide powder;
[0029] The mineralizer is composed of silicon dioxide, magnesium oxide and titanium dioxide in a mass ratio of 1:1:1;
[0030] Described plasticizer is made up of the raw material of following weight part:
[0031] Paraffin wax 90, propolis 3, terpene resin 4, polyethylene oxide 2, silane coupling agent KH550 0.2;
[0032] Heat and soften the above terpene resin, add polyethylene oxide, stir evenly, add the remaining raw materials, stir and disperse at 800 rpm for 4 minutes, cool and discharge to obtain the plasticizer;
[0033] The preparation method of described rare earth coated magnesium oxide comprises the following steps:
[0034] (1) Add magnesium oxide and kh570 silane coupling agent to glycerin, and ball mil...
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