SU711009A1 - Charge for mullite production - Google Patents

Description

(54) CHARGE TO GET MULLITE

one

The invention relates to the manufacture of ceramics, namely, aluminosilicate compositions for the production of mullite and can be used in high-melting glass melting for the manufacture of critical glass melts, protective layers on clay-bonded vessels, as well as for the manufacture of glass melting parts for glass melting furnaces.

The known refractory masses for the manufacture of refractory materials used in glassmaking as precursors contain clay materials, which are sources for the incorporation of iron and titanium oxides into optical glass 1 and 2. Therefore, despite their good ceramic properties, these refractory materials are not applicable in optical glass melting.

The closest to the technical essence and achievable results to the proposed is the charge for the production of mullite, including alumina and silica in stoichiometric ratio and magnesium oxide in an amount of 0 - 5 wt.% (3.

The disadvantage of this problem is the relatively low temperature resistance and corrosion resistance of the materials obtained from it.

The purpose of the invention is to increase heat resistance and corrosion resistance.

The goal is achieved by the fact that the charge for obtaining a magnet consisting of α-alumina, silica and magnesia, or an organometallic soluble compound of magnesium, contains vitreous silica and additionally barium glass in the following ratio of components, wt.%:

ct-alumina 62-73,9

Silicon dioxide 23.2 -32.5

Magnesium oxide or organometallic soluble magnesium compound 0.5-2.9

Barium glass1-4.7.

The barium glass used in this mixture has the following composition, wt.% SiOj60

BaO38.

2

Na, O

37

By introducing barium glass into the process, the formation of a glass phase is obtained, an increase in the yield of needle-like mullite is achieved. Needle crystals of mullite ggov step temperature resistance of the resulting material.

And the solvents to produce mullite are prepared as follows.

a-alumina and silica glassy, together with magnesium oxide and barter glass, previously welded and crushed, subjected to fine grinding in a spherical copper with a ratio of the formula of the formula 1. The mixture for obtaining mullite, including a-alumina, silica and magnesia or an organometallic soluble compound of magnesium, characterized in that, in order to increase its bridgeiness and corrosion resistance, it contains glassy silicon dioxide and additionally barium glass with th component ratio, wt%: v. (62-73,9-alumina 23,2-32 silicon dioxide or magnesium oxide metalloorganideskoe soluble soedinenie0,5-2,9 Barium -4,7 steklo1

10094

rial: balls: water 1: 3: 1, dried for 2–2 days in air or in a cupboard at 100 ° C is molded and calcined in an oven at 1550–1650 ° C for 3-5 h.

5 The content of iron oxides in the resulting material is 2-10 wt.%. Diffusion of iron oxides from refractories to glasses such as crowns and heavy flints is not observed. The light absorption of glasses welded in mullite fire 10 stops is 2 times less than in platinum.

The compositions of ishhta and the properties of the materials obtained from them are given in the tabluda. 2. The mixture according to item 1, about tl and h and y; a; j with / em, that it contains barium glass of the following composition, wt.%: SiOj60 BaO38 N32 O2 Sources of information, taken in attention at examination 1 . US patent N 3758318, cl. 106-65, 1973. 2. US Patent. No. 3989783, cl. 264-56, 1976. 3. French Patent No. 2190760, l. .C 04 B 35/10, 1974.

Claims (2)

Claim 1. The mixture to obtain mullite, including α-alumina, silicon dioxide and magnesium oxide or an organometallic soluble compound of magnesium, distinguishes 2. The mixture according to claim 1, on the basis of the fact that it contains barium glass of the following composition, wt.%: S iOj 60 Bao 38 Na ₂ O 2 This is due to the fact that, in order to increase heat and corrosion resistance, it contains silicon dioxide glassy and additionally barium glass in the following ratio of components, wt.%: with aluminum oxide 62-73.9 Silica 23.2-323 Magnesium oxide or metal organic soluble compound 03-2.9 Barium glass 1 -4.7