Thesis (M.S.)--Virginia Polytechnic Institute, 1961. / Vita. Abstract. Includes bibliographical references (leaves 58-59). Also available via the Internet.

The following investigations have been carried out in this thesis 1)Cordierite is already well known for its low thermal expansion behaviour. Chemical substitutions at various octahedral and tetrahedral sites have been done and their thermal expansion characteristics have been studied Synthesis of cordierite in more reactive environment provided by AlF3 used as sintering aid has been attempted 2) Diffuse ferroelectric phase transition of lead based perovskite materials leads to low expansion region. Solid solutions of lead iron niobate with lead titanate is investigated to increase the structural distortion and see it this low expansion region can be extended to wider temperature Preparation of materials with higher tetragonal distortion In PbTi03- BlFeO3 system is undertaken to study the thermal expansion anisotropy. 3) Composites between lead iron niobate(+(x) and lead titanate (-(x below Tc) has been undertaken to prepare low expansion hulk over a wide temperature range 4) Acoustic emission has been employed as a tool to detect the microcracking in solid solutions between PFN1-x, PTx, and PT1-x, ,BFx, It is hoped to understand relation between magnitude of lattice distortion transition temperature and microcracking in ceramics of the class of materials.

В результате проведенных исследований подобраны и исследованы отечественные сырьевые материалы, рассчитан и разработан состав массы прекурсора и синтезирован композитный материал для производства кордиеритовой керамики. Разработаны составы масс для производства кордиеритовой керамики различными способами формования: шликерным литьем, пластическим и полусухим формованием. Проведенные исследования показывают возможность получения кордиеритовой керамики на основе сырья отечественных месторождений с высоким содержанием α-кордиерита. / As a result of the conducted research, domestic raw materials were selected and studied, the composition of the precursor mass was calculated and developed, and a composite material for the production of cordierite ceramics was synthesized. Mass compositions for the production of cordierite ceramics by various molding methods have been developed: by slip casting, plastic and semi-dry molding. The results of investigation show the possibility of obtaining cordierite ceramics based on the raw materials of domestic deposits with a high content of α-cordierite.

Разработаны составы масс для производства керамических кордиеритовых субстратов различными способами формования: полусухим и пластическим формованием. Проведенные исследования показывают возможность получения кордиеритовой керамики на основе сырья отечественных месторождений с высоким содержанием кордиерита. / Mass compositions to produce ceramic cordierite substrates by various molding methods have been developed: semi-dry and plastic molding. The conducted studies show the possibility of obtaining cordierite ceramics based on raw materials from domestic deposits with a high content of cordierite.

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The diploma thesis focuses on new possibilities to reduce raw materials costs in production of heat-resistant cordierite ceramics. Cordierite is very often used as furnace wagon lining and for production of blazing utilities for its high resistance against temperature changes. The thesis gives complete overview of cordierite material. It includes description of different production technologies for form-pieces preparation, raw materials for their production and their applications. The goal of performed laboratory measuring in an experimental part was to verify and prove a possibility of reducing raw-material costs in production of cordierite ceramics by using cheaper preferably secondary raw materials.