Фізико-хімічні фактори структуроутворення та інтенсифікації лиття виробів будівельного фарфору
| dc.contributor.author | Сальник, Валерій Григорович | |
| dc.contributor.degreedepartment | хімічної технології композиційних матеріалів | uk |
| dc.contributor.degreefaculty | хіміко-технологічний | uk |
| dc.contributor.degreegrantor | Національний технічний університет України "Київський політехнічний інститут" | uk |
| dc.date.accessioned | 2013-12-10T09:48:07Z | |
| dc.date.available | 2013-12-10T09:48:07Z | |
| dc.date.issued | 2013 | |
| dc.description.abstracten | This thesis work is dedicated to the development of the physical and chemical grounds for the technology to produce sanitary stoneware thru different methods of structure formation into porous molds, including pressurized processes. The comprehensive research of the initial feedstock and of the disperse systems based on such feedstock have resulted in the formulation and scientific substantiation of the objective laws explaining how the energy state of the particles' surface during the disperse phase influence their lyophilic behavior, coagulative structure formation, and filtration intensification under normal conditions and under external pressure. The document describes the particularities of the chemical and mineralogical composition and properties of kaolins and clays found at the Ukrainian deposit fields and those of the feedstock coming from abroad. The thesis work also gives the details of how the coagulative structure of clayish water systems is formed and the analysis of kinetic properties in filtration during the formation of cast products by plaster mold casting under the normal conditions and by polymeric mold casting under external pressure. The frequency series for clays as well as for non-enriched and enriched kaolins are determined with regard to their dispersability and to the content of fine-dispersed particles <0.001mm and <0.01mm in size. It has been determined that, given the maximum degree of poor dispersion and the smallest effective specific surface, the best liquescency in water systems of non-enriched alkaline kaolins would be reached under a higher concentration of the disperse phase, which is 60.0% as compared to 50.0…30.0% for the samples of Santon-L, ESBKA-2, and KICK-2, and which is 35.0…15.0% for clays and enriched kaolins found within Ukraine. The development of deformation processes in the even of coagulative structure formation of clay and kaolin suspensions under identical concentrations of the disperse phase is linked to the particularities of the mineralogical composition, genesis, morphology, and crystallochemical structure of particles of the rock-forming minerals. The thesis work has determined the priority significance of surface properties of clay particles for regulating the structure formation processes and for the technological properties of porcelain mixture during slip casting. It has been shown that the lyophilic/lyophobic balance of the surface, its energy state, development level, and dispersive properties are of key importance for the processes used in formation of the coagulative structure of kaolin dispersions. It has been determined that the technological properties of kaolin dispersions are caused by the abovementioned factors, which, if duly taken into account, would enable the directed alteration of the injection properties of kaolin-containing water systems within broadened limits. The good injection properties of the alkaline kaolin suspensions along with their lowered efficient specific surface can be explained in relation to a relatively smaller share of bound water and an accordingly greater share of immobilized water, which is more intensively filtered thru the wall boundary layer where the increased permeability is caused by the poor dispersive behavior and thus by a littler number of contacts and a greater porosity. It has been determined that the replacement of clay components with those similar in chemical composition, but having poorer dispersive behavior and greater hydrophobic properties would increase the flow rate and filtration properties of the clay suspensions while retaining lower humidity, which is especially important when stoneware casting technology is used. The document suggests using the methods of directed modification of surface by means of hydrophobization and thermal activation. The author has proved the possibility to regulate the structural, mechanical, and rheological properties of a coagulative structure as well as to increase the flow rate and the intensification of casting in porous molds when using the preliminary hydrophobization of kaolin. The author has evidenced the efficiency of comprehensive usage of enriched and non-enriched clay feedstock with various degrees of hydrophilic and dispersive properties found at the Ukrainian deposit fields as a factor to influence the coagulative and crystallization structure formation of porcelain mixture. It has been pointed out that imperfect structure, increased reactivity of the rock-forming minerals, and the development of the quartz-fieldspathic glass phase are the factors to intensify the formation of mullite when ceramic products are being fired. The increased content of K2O in the products being developed is a factor increasing the viscosity of the liquid phase and, accordingly, increasing the deformational stability of such products during the firing process. New compositions of porcelain stoneware and ceramic glazes have been developed to ensure the intensification of the sanitary stoneware production processes in the course of plaster mold casting at mechanized equipment and in the course of polymeric mold casting under external pressure at high-output equipment, and such approach has been introduced for the first time in Ukraine. | uk |
| dc.description.abstractru | Диссертация на соискание ученой степени доктора технических наук по специальности 05.17.11 – технология тугоплавких неметаллических материалов. – Национальный технический университет Украины "Киевский политехнический институт", Киев, 2013. Диссертация посвящена разработке физико-химических основ технологии производства санитарной керамики с дифференциацией способов формования литьем в пористые формы, в том числе под внешним давлением. | uk |
| dc.description.abstractuk | Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.17.11 – технологія тугоплавких неметалічних матеріалів. – Національний технічний університет України "Київський політехнічний інститут", Київ, 2013. Дисертація присвячена розробці фізико-хімічних засад технології виробництва санітарної кераміки з диференціацією способів формування литтям в пористі форми, в тому числі під зовнішнім тиском. | uk |
| dc.format.page | 44 л. | uk |
| dc.identifier.uri | https://ela.kpi.ua/handle/123456789/6356 | |
| dc.language.iso | uk | uk |
| dc.publisher | Національний технічний університет України "Київський політехнічний інститут" | uk |
| dc.publisher.place | Київ | uk |
| dc.status.pub | published | uk |
| dc.subject.udc | 666.596 : 544.77 | uk |
| dc.title | Фізико-хімічні фактори структуроутворення та інтенсифікації лиття виробів будівельного фарфору | uk |
| dc.type | Other | uk |
| thesis.degree.level | doctor | uk |
| thesis.degree.name | доктор технічних наук | uk |
| thesis.degree.speciality | 05.17.11 – технологія тугоплавких неметалічних матеріалів | uk |