DE9621C - Process for enamelling iron cast goods by applying the enamel mass to the core of the casting mold - Google Patents

Description

1879.

Class 48.

NICOLAUS HENZEL in PRAGUE and LADISLAUS BROZ in ROKYCAN (Bohemia).

Process for enamelling Eisengufswaaren by applying the enamel mass to the Core of the mold.

Patented in the German Empire on July 12, 1879.

The production method that has been used since then when enamelling Eisengufswaaren consists in the fact that the cast object is carefully cleaned, in a cold state covered with the base mass and this was initially burned in. To the basic mass the glaze and the manipulation were then applied again in the cold state of glow repeated.

In the present new process, glazing is combined with casting.

First, the mold and core are made in the usual way. The core will provided with an insulating coating of graphite and very carefully smoothed. on this graphite coating becomes the enamel mass, finely dispersed in the water Applied in a very even layer, and the core dried. Also can the enamel mass in the dry state by dusting and subsequent polishing the moist clay core respectively. whose black layer is fixed. It comes down to big If the enamel or glaze is not smooth, the insulating graphite layer (blackness) is added Application of sand cores away.

The ones with the email or Glazed cores are made in the manner of it to produce a dense cast is always observed, with a slow increase in Heat dried and, when ready, placed in the appropriately dry form so that one Re-absorption of moisture is avoided. The Gufs must be a very calm one, therefore the use of such substances for the enamel mass is to be avoided, which in the heat of liquid iron develop gases, vapors and sublimates. The liquid iron that comes with the email or Glaze comes into contact, this melts and the connection the iron with the enamel becomes much more intimate because of the higher melting temperature of iron, extremely favorable compared to the otherwise applied low annealing temperature is effective. The objects enamelled in this way remain in shape until the usual Air temperature can no longer have a harmful effect on the enamel.

One need not limit oneself to the inside of the goods, but rather can also enamel their exterior in the manner described.

The enamel materials to be used essentially consist of sodium and / or sodium. Potassium oxide, calcium oxide and silicic acid, possibly also from alumina and boric acid.

The following masses are recommended:

No. ι obtained by melting together: silica (quartz). . . . 28 weight st. Carbonate of soda (calcined

Soda) ..... 11
Carbonate of lime (chalk) 6

No. 2 obtained by fusing together:

Silicic acid 34 weight st.

Carbonated Soda ... 11
Carbonate of lime .... 12

No. 3 obtained by fusing together:

Silica. 34 weight st.

Carbonated Soda ... 11
Carbonate of lime .... 12
Air-dry lime-free pipe

thon ....... 5

No.4 obtained by melting together:

Silicic acid 34 weight st.

Carbonated Soda ... 6
Carbonate of lime. . ... 12

In all of the mixtures given here, the purely anhydrous state of the silica is of carbonate of sodium and calcium oxide. Treating this Substances is the same as in the production of previously used enamel masses, namely PuI-verisiren, Mixing, melting or frying, grinding and feasting.

Depending on the strength and meltability of the casts to be enamelled, the Provide the aforementioned masses with additives that better adhere to the form or bring about the kernel. As such a medium, pipe clay, preferably unfired, is however also burned, to be recommended.

For Gufswaaren whose enamelling should be particularly elegant, as well as for cookware it is recommended to use the cast enamel as a base and to put it in

usually to be provided with a cover. In such cases, the corresponding parts of the mold are not coated with graphite, since it is then desirable is that the surface of the basic enamel is rough. To create a special White enamel, however, we then use very fine white iron-free molding sand for the molds or, where such is not available, we cover them instead of blackness, with fine quartz flour, which is then mixed with the enamel mass to be applied to it when pouring connects and prevents the molding sand from being fritted.

Claims (1)

PATENT APPLICATION: The production of enamelled or glazed surfaces on iron cast goods of any kind Applying the email or Glaze on the relevant surfaces of the form BEZW. of the core, so that the enamel mass melted under the action of the molten iron is and is united with it for the purpose of producing cheap enamelled Gufswaaren and in the manner as described and explained above, without consideration however, on the email masses to be used, the choice of which depends on the respective Depends on circumstances.