SU1265159A1 - Enamel - Google Patents

Abstract

The invention allows to extend the firing interval and reduce the duration of cooking by introducing into the enamel the trace of lean components, wt.%: SiOj 60.60-70.00; 0.1-1.18} CaO 0.35-2.58; 16.34-28.50; AljOj 1.06-1.79; BjOj 4.72-5.00; MgO 0.22-1.64; CuO 0.1-1.96; F 2,592, 78. Steel enamel has a cooking temperature of 1250-1300 ° C, a cooking time of 2.5 hours, a firing interval of 720-940 ° C, a heat resistance of 465-480 ° C, and acid resistance of 0.018-0.1 mg / cm. 2 tab. with (L with

Description

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The invention relates to compositions of acid-resistant low-melting enamels for steel intended to protect steel equipment from aggressive media, and can find applications for chi-1, 1 naphtea and other industrial strands. The purpose of the invention is to expand the interval and reduce the cooking time. The compositions of the proposed enamel are given in Table 1. For the preparation of enamel, sand glass flour, boric acid, sodium hydrogen sulphate, cryolite, chromium and copper oxides are used as starting materials. Glass flour can be obtained by grinding glass bo-waste in the production of window glass, for example, of the following composition, -me,%: These components are metered, metered and melted in an oven at 1250-1300 ° C. Cooking time depends on the amount of charge and furnace design. The melted mass is poured into a bath of running water to obtain a small frit, then dried, crushed with the introduction of suspending additives and in the form of a suspension are applied pre-ground, primed product.

Claims (2)

Table 1 Suspension prepared from the following components, wt.%: Enamel Frit 100.0 Clay Potash Chromium Oxide Slurry preparation :: tv-ball melas-to-fineness are ml (by the method of Lysenko). grinding 12-10 The slip is dipped or dipped onto the product and dried. The product with the dried coating is placed in an oven, where it is calcined at 780-800 ° C for 5-10 hours. The compositions of the proposed enamel have properties, which are favored in the table. 2. The invention Enamel, including SiO, -.Oz. CaO, Ma O, o tl and h aa with the fact that, in order to expand the range and reduce the cooking time, it additionally contains 1T., B., O, l-IgO, CuO, F with the following ratio of components % by weight: 60.60-70.00 0.1-1 .18 0.35-2.58 16.34-28, -50 1.06-1.79 4.72-5.00 0 , 22-1.64 0.1-1.96 2.59-2.78. 65J566,7768,0361,8870,0069,9460,60 1,151,791,061,181,781,731,30 4.88 4.864.725.004.834.824.85 0.672,, 580,350,682,332,321.04 0.411,640,220,421,481,480,64 22.0916.6321.8627.6716.4016.3428.50 CaO1.86 1.96 0.79 0.40 0.10 0.20 0.10 Ci-jOj1.18 1.18 0.31 0.10. 0.30 0.50 0.30 F2.61 2.59 2.66 2.67 2.78 2.67 2.67 Temperature 1250-1300 1250-1300 1250-1300 G250-1300 cooking, ° C Duration of cooking, h 2.5 2.5 2.5 2.5 Temperature, C 760 -780 780-800 760-780 760-770 Firing interval, ° С, 740-940 750-900 740-940 720-920 Capacity of the coating, weight loss, ng / sn 0.065 0.018 0.1 Temperature resistance, sec The continuation of the table. I 250-POO 1250-1300 1250-1300 2.5. 2.5 785-795 770-790 760-780 740-890 740-920 740-930 0.02 0.02 480 480