SU1749194A1 - Ground enamel - Google Patents

Abstract

The essence of the invention: ground enamel contains, wt%: silicon oxide 35.3-39.1 BP of SiO2, aluminum oxide 1.8-2.4 BP, boron oxide of 20.8-23.2 BP of sodium oxide, 22.8 -25.5 BF Na20, calcium oxide 1.4-5.2 BF CaO, cobalt oxide 0.4-0.5 BF CoO, nickel oxide 1 2-1.3 BF N10, manganese oxide 2.5-2.8 BF Mp02 zirconium oxide 4.2-6.5 bf Zr02. Enamel characteristics: optimal calcination temperature is 740-760 ° C, calcination interval is 670-820 ° C, flowability is 68-72 mm. impact strength 1.1-1.2 J. 2 ta b l

Description

The invention relates to silicate low-temperature enamels for ground coating on steel and can be used to obtain anti-corrosion coatings on household and gas appliances.

Known composition of the enamel containing, wt.%. SI02 29.84-35.4. A1203 0.01-5.0. B203 16.66-27.08; Na20 13.11-20.40; CaO 0.97-1.27; CoO 0.03-0.04; MJ 0.55-0.72; Re20z 15.42-20.21; K20 3.0-11.92; Cr203 0.01-0.8; MDO 2.9-3.79.

I (the residue of this enamel is the content of a large amount of potassium nitrate, which at high temperatures decomposes into nitric oxide (53.4%) and potassium oxide (46.6%)

The closest to the proposed zmala in chemical properties and composition is mal, containing, in wt.%: 33.1-35.1; AfaOa 2.8-4.3: B20z 19.8-22.0: N820 23.8-27.0; CaO 10-11,4; CoO 0.4-0.5; N10 0.6-0.7; Mp02 0.5-3.8; TiO2 0 1-2,4; Re203 0.5-1.4; 0.2-0.8.

A disadvantage of the known enamel is a small firing interval and a low adhesive strength. I

The purpose of the invention is to expand the inter firing shaft and increase the adhesion strength.

Soil enamels for steel, including SI02, AtaO, V20z. Na20, CaO. CoO, N10, Mp02 additionally contains Zr02 in the following ratio of components, wt.%: Si02 35.3-39.1, 1.8-2.4; B203 LVr 20.8-23.2; Na20 22.8-25.5; CaO 1.4-5.2; Soo Yu 0.4-0.5; N10 1.2-1.3; Mp02 2.5-2.8: Zr02 4.2-6.5.jsQ

Specific compositions of enamels are given in table 1.

For preparation of the charge, quartz sand, zirconium ore, alumina, borax, soda, calcium carbonate, cobalt) are used to make the charge, and manganese oxide.

Enamel cooking was carried out at 118 ° C 200 ° C for 60 minutes, followed by granulation on water.

To obtain a slip, the Frit is ground in a laboratory ball mill, the following components are added, may

100

10-12

4-5

0.08-0.2

0.1

35-40

The fineness of grinding is 12-14 units, in a vessel Lysenko (Azarov method), the specific gravity is 1.72-1.74 g / cm3.

The resulting slip is applied to the prepared steel surface and fired at 740-820 ° C.

The properties of the compositions are given in table. 2

The use of soil enamel to obtain anticorrosive coatings on household appliances allows increasing its adhesion to the metal, reducing the cost of 1 ton of frit,

reduce electricity consumption for firing products.

Claims (1)

The formula of the invention of the Soil enamel, including, А 20з, ВаОз, N320. CaO, CoO, N10. Mp02 About t-l, which, in order to extend the firing interval and increase the adhesion strength, it additionally contains ZrOa with the following ratio of components, May.%: SI02,35,3-39,1  1.8-2.4 B20320.8-23.2 Na2022.8-25,5 SEO1.4-5.2 Soo0,4-0,5 NoO1,2-1,3 Mp022,5-2,8 Zr024.2-6.5 Limiting values. Table 1 Cooking temperature, ° SP80 Interval interval, ° C Optimum firing temperature. Gloss (mirror reflection coefficient),% Growing up, mn 670-820 68 70 1200 1200 1190 1200 1200 1180 1200 630-820 700-820 670-820 700-8 20 720-320 670-820 760-8 0 TKLR.oMO 117.7 Impact strength , 2 760 68 70 115.2 1.2 750 65 68 FROM M 750 65.5 70 118.0 1.15 755,790,780-800 67 6d 62 6l-6d 70666955-65 PM 119.3 112.6 108-hp 1.1 1.05 0.90.7-0.9 H - Limiting values. Table 2 750 65.5 70 118.0 1.15 755,790,780-800 67 6d 62 6l-6d 70666955-65 PM 119.3 112.6 108-hp 1.1 1.05 0.90.7-0.9