Development of a sol-gel technique for obtaining sintering activators for engobe coatings
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 6, Issue 6
Abstract
<p>We have developed a technology for manufacturing the glass ligaments-activators to intensify the sintering of ceramic materials, specifically engobe coatings. The comparative analysis has been performed into the glass ligaments obtained through a conventional glass melting and by applying the sol-gel synthesis. Large efficiency of the latter has been established related to the reduced energy costs required to thermally treat a composition (rather than melting glass at 1,300–1,400 °C, gel is to be thermally treated to 600 °C) as well as to the improved homogeneity of the glass ligament (chemical formulation of the composition is averaged at a molecular level).</p><p>Different sol-gel techniques for obtaining glass ligaments-activators have also been examined: a powder sol-gel technique without calcination; a sol-gel technique for the preparation of solutions of salts; a powder sol-gel technique with the composition melting. The specified techniques differ in the sequence and method for mixing the source components, while their dispersion in a gel-forming agent the ethyl silicate ETS-40 is mandatory. The chosen basic components of the activator were soluble salts Al(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O, Ca(NO<sub>3</sub>)<sub>2</sub> and NaNO<sub>3</sub>. We have investigated pattern in change of the phase composition of glass ligaments at their heating to 600 °C. It has been established that all obtained compositions approach the amorphous state at temperatures of ~600 °C. Further heating of the examined glass ligaments to 1,000 °C leads to their intensive melting. In this case, for the first two techniques, the viscosity and surface tension of melts are less compared to the melt of conventional glass, and, therefore, the wetting capacity of glass ligaments-activators is higher.</p>When introducing these sintering activators to the compositions of ceramic coatings, it was established that the most effective is the activator that was obtained by a technique for the preparation of salt solutions. It is the one that provides, after annealing at 1,170 °C, for the densest structure of the sintered coating with reduced water absorption (not exceeding 0.05 %) and high whiteness of the surface (87–88 %). The activators that we developed could become an alternative to conventional glass-ligaments whose melting requires considerable energy costs
Authors and Affiliations
Olena Khomenko, Eugene Alekseev
Keywords
Related Articles
- EP ID EP528283
- DOI 10.15587/1729-4061.2018.150606
- Views 37
- Downloads 0
Astabilizing system for butter pastes based on the dry concentrates of milk protein
<p>The composition of the stabilizing system for butter pastes based on dry concentrates of milk and whey proteins has been substantiated; that would help reduce the deficiency of protein in the diet of modern human and...
Determination of thermal and physical characteristics of dead pine wood thermal insulation products
The studies allowed manufacturing dead pine wood thermal insulation materials for the arrangement of premises. Raw materials for their production are wood fibers formed as flat boards. The mechanisms of the thermal insul...
Analysis and optimization of the reactive power compensation modes in a power supply system
<p>The paper reports the study of modes in a single-phase generalized power supply system in terms of improving energy indicators in the system by compensating for the reactive power. We considered three test versions of...
Modeling a thermal conductivity process under the action of flame on the wall of fireretardant reed
<p>Creating environmentally friendly flame-retardant materials for natural inflammable roof structures will make it possible to control the processes of thermal stability and physical-chemical properties of a protective...
Substantiation of countervortex spillway structures of hydrotechnical facilities
<p>The construction and reconstruction of waterworks sets a number of scientific and engineering tasks that require a new approach to their solution. One of the promising areas for solving these and a number of other pro...