Glass-enamel Coatings Research Articles

Wear Resistance of Glass Enamel Coatings Fired in a High-Frequency Alternating Field

The effect of firing glass-enamel coatings in a high-frequency alternating electric field on their wear resistance is studied. It is shown that wear resistance grows 2.8 – 5.5 times depending on the type of the coating. Ellipsometric studies established that the increase in wear resistance of glass-enamel coatings formed under the effect of a HF field is inversely proportional to the variation of the refractive index of the glass matrix.

Elimination of Defects on Glass-Enamel Coating Using Laser Radiation

Glass-enamel coatings with pinhole defects repaired using pulse laser radiation are analyzed. It is demonstrated that thermal resistance and acid resistance of repaired coatings are no less than those of coatings without defects, whereas microhardness of coating in a repaired zone is higher than that of the base.

High-Temperature Protective Properties of Glass-Enamel Coatings Based on Coal Ash

The compositions and properties of glass coatings intended for steel protection at hot-deformation temperatures are presented. Up to 75% coat ash, which is waste generated by thermal power plants, is introduced into the composition of glass coating. The rates of oxidation of steel 08kp under the proposed coating and in air are determined.

ONE-COAT FLUORINE-FREE ENAMELS WITH A DECREASED COBALT OXIDE CONTENT

The effect of variable-valence oxides on the adhesion strength and elasticity of one-coat fluorine-free coatings is studied. The possibility of lowering the cobalt oxide content in the enamel composition, at the expense of introducing variable-valence oxides (NiO, CuO, and MnO2) in the optimum ratio, without deteriorating the technological and service properties of glass enamel coatings, is established.

Glass enamel coatings for steel pipes for hot-water supply systems

Results of comparative tests for water resistance of single-coat glass enamels used for protecting pipelines of hot-water supply systems and developed by the Institute of General and Inorganic Chemistry of the Academy of Sciences of Belarus (IONKh) are presented. It is shown that T45 enamel has an elevated water resistance, heat resistance, and mechanical strength and is ecologically safe, which makes it suitable for the protection of the inner surface of the pipes. The use of T45 enamel will prolong the service life of the pipelines and decrease the cost of their maintenance.

Synthesis and dilatometric investigation of high-endurance composite glass-enamel heat-resistant coatings

Using a Sheffer simplex-lattice design method and substituting chromium(III) oxide, while plays the role of a refractory filler, by nickel(II) oxide and iron(III) oxide, new composite heat-resistant enamel coatings were created for nichrome KhN78T. The coatings are characterized by weak sublimation of chromium compounds and an elevated TCLE, which change gradually with the temperature.

Graphic-analytical model for predicting the uniformity of glass enamel coatings

A graphic-analytical model that makes it possible to estimate the capacity of a metal-melt system of a formed coating for producing inhomogeneities in the form of nonsealed shrinkage cracks and to calculate the numerical values of the characteristics of the system for which the coating will have no defects is presented.

Synthesis of one-layer glass-enamel coatings for domestic products

Synthesis of one-layer glass-enamel coatings for domestic products

Anticorrosion properties of glass-enamel coatings in media containing hydrogen sulfide

Anticorrosion properties of glass-enamel coatings in media containing hydrogen sulfide

Glass-enamel coatings based on apatite-nepheline ore dressing products

Among the promising raw materials are products from the dressing of apatite-nepheline ore from the Partamchorr (Kolar Peninsula) deposit [i, 2], which have a complex composition. Besides apatite and nepheline they contain about 20 different minerals. The chemical composition of some apatite-nephel%ne ore dressing products* are given in Table i. All of these materils, produced on a commercial scale, have constant chemical and mineralogical compositions.

Nucleation and growth of microcracks in glass enamel-metal composites

1. The experimental data should attract the attention of designers of chemical plant, including developers of glass-enamel protective coatings as well as users operating this type of equipment in specific chemical-technology processes, to the need for a complex and, in each specific case, correct approach to solving problems of corrosion protection of metals. Compulsory (testing) tests of the GEM to be used for operation under alternating temperature and force conditions should be represented by tests of these composites in cyclic creep and thermal shock in the expected range of service temperatures and pressures. 2. An increase of the fracture toughness Glc of the glass-enamel coatings by, for example, reinforcing their glass matrix greatly reduces the probability of the failure of GEC during service. It is most efficient to reinforce these coatings at densities of critical defectsρS ≤ 3.

Adhesion of heat-resistant composite glass-enamel coatings with nichrome alloy

Adhesion of heat-resistant composite glass-enamel coatings with nichrome alloy

Recording penetrative defects in glass enamel coatings

Recording penetrative defects in glass enamel coatings

New method for producing glass matrices for heat-resistant glass-enamel coatings

New method for producing glass matrices for heat-resistant glass-enamel coatings

Anticorrosion glass-enamel coatings

Anticorrosion glass-enamel coatings

Glass enamel coatings for electrical domestic machines and appliances

Glass enamel coatings for electrical domestic machines and appliances

Experimental determination of the thermal conductivity of glass-enamel coatings

Experimental determination of the thermal conductivity of glass-enamel coatings

Corrosion resistance of glass enamel coatings in the production of acetic acid

Corrosion resistance of glass enamel coatings in the production of acetic acid

Glass-enamel coatings for the fire protection of oxygen equipment

Glass-enamel coatings for the fire protection of oxygen equipment

Corrosion resistance of glass enamel coatings in acrylate production media

Corrosion resistance of glass enamel coatings in acrylate production media