Based on high purity alumina and quartz powders and IG-017 bio-original additives the authors have developed new ceramic composite materials for different industrial purposes. The main goal was to fine a material and morphological structures of high performance ceramic composites as frames for development complex materials for extreme consumptions in the future. For this the mixed powders of Al 2 O 3 , SiO 2 and IG-017 bio-original additive were uniaxially pressed at different compaction pressures into disc shapes and were sintered in electric kiln under air (1) and nitrogrn (2) atmosphere. The grain size distributions of the raw materials were determined by laser granulometry. There thermo-physical properties were also determined by derivatography.The prepared and sintered specimens were tested on geometrical sizes, microstructure and morphology by scanning electron microscopy, porosity and water absorption. In this work the authors present the results of their research and investigation.
Minerals of disintegrated alkaline-ultrabasic dike rocks exposed by wells within the rare-metal–rare earth Novobo-brovsky ore field (Middle Timan) were studied. Microprobe studies were conducted in CCU "Geoscience" (Syktyvkar) and the Institute of Experimental Geology, RAS (Chernogolovka). Primary mineral parage-neses are difficult to diag-nose due to strong secondary alteration of rocks. The primary minerals are phlogopite (XMg = 0.64–0.89) and minerals of the chromespinelides group (the central parts are represented by chrompicotite, and the marginal zones – by ferrich-romite); the secondary minerals are represented by the chlorites group (talcochlorite, clinochlorite, pennine). The rock is saturated with numerous xenoliths of quartzite sandstones, and has also undergone fenitization processes, which is why the development of rare metal–rare earth mineralization is observed in the rock: columbite, rutile ↔ Nb-rutile ↔ ilme-norutil, monazite, Th-monazite, more rare phosphates (complex phosphates and hydroaluminophosphates of lead similar in composition to dragmanite, differing by the presence of Mn, Ba, K). The studied primary mineral parageneses are typical for the picrite-lamprophyre Chetlas dike complex developed here; the superimposed rare-metal–rare-earth mineralization is specific for dike rocks developed within the ore fields of the Kosyu ore cluster.
The petrochemistry and geochemistry of dolerites and basalts of the Late Devonian Kanin-Timan complex of the Kanin Peninsula and the Middle Timan are considered. Petrochemically, the rocks of the Kanin-Timan complex of the Kanin Peninsula and the Tsilma river area of the Middle Timan correspond to basaltoids of the normal range of alkalinity and partially to moderately alkaline varieties, and belong to the tholeiitic series. The least differentiated varieties are dolerites of the southeastern Kanin Peninsula, the most differentiated are the basalts of the river Tsilma of the Middle Timan. The lowest REE concentrations were found in the rocks of the central part of the Kanin Peninsula (36.5-56.8 g/t); in the same samples, the lowest LaN/YbN values were recorded (1.85 and 2.4, respectively), which indicates an increased degree of melting of the source. The highest REE concentrations were found in basalts from the river Tsilma (77.13-88.33 g/t), LaN/YbN values (2.49-2.7, respectively). The influence of the crustal component in the formation of melts from which rocks of the Kanin-Timan complex were formed, was established. The source of the melt was spinel-garnet lherzolite, the degree of melting varied from 10 to 30%. The maximum degree of melting was 30%, at which melts were formed, that gave rise to the least differentiated rocks of the Northern Timan and the central part of the Kanin Peninsula. The mantle source, that gave rise to the melts from which the rocks of the Kanin-Timan complex were formed, was enriched with subduction and crustal components, a similar type of source is characteristic of the basaltoids of the No-rilsk trough.
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