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2 2020

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Doświadczalne sprawdzenie chłonności pochłaniaczy wilgoci w różnych warunkach klimatycznych

Korzeniowski Janusz

Problemy Techniki Uzbrojenia

2020

R. 49, z. 153

87--108

W artykule przedstawiono wyniki badań dostępnych na rynku i aktualnie eksploatowanych pochłaniaczy wilgoci. Doświadczalnie sprawdzono parametry dwóch typów żeli krzemionkowych, glinki bentonitowej i dwóch typów sit molekularnych dostępnych na rynku oraz aktualnie eksploatowanego w sprzęcie uzbrojenia wielokrotnie regenerowanego silikażelu. W ramach pracy określono maksymalną chłonności pochłaniaczy wilgoci dla różnych warunków klimatycznych, minimalny poziom wilgotności względnej (RH) w osuszanej komorze pomiarowej dla różnych ilości absorbentu oraz trwałości wiązania wody w zmiennych warunkach temperaturowych. Analiza otrzymanych wyników pozwoliła porównać rodzaje absorbentów określić ich zalety i wady oraz pozwoliła ocenić stopień zużycia aktualnie eksploatowanego absorbentu wilgoci w sprzęcie uzbrojenia.

The article presents results of tests for moisture absorbers currently used and available on the market. Experimental investigations were carried out for two types of silica gels, the bentonite clay and two types of molecular sieves available on the market, as well as for the reused silica gel currently deployed inweapon systems. As part of the work, the maximum absorbency of moisture absorbers for various climatic conditions, the minimum relative humidity (RH) in the drying measuring chamber for various amounts of absorbent, and the durability of water binding at variable temperature conditions were determined. Analysis of results allowed both to compare advantages and disadvantages of various absorbents, and to assess a degree of the wear for moisture absorbents currently used in armament equipment.

Effect of Bentonite Clay Addition on the Thermal and Mechanical Properties of Conventional Moulding Sands

Kamińska J., Puzio S., Angrecki M.

Archives of Foundry Engineering

2020

Vol. 20, iss. 1

111--116

Bentonites and clays are included in the group of drilling fluids materials. The raw materials are mainly clay minerals, which are divided into several groups, like montmorillonite, kaolinite, illite, biotite, muscovite, nontronite, anorthoclase, microcline, sanidine or rutile, differing in chemical composition and crystal lattice structure. Clay minerals have a layered structure forming sheet units. The layers merge into sheets that build up to form the structure of the mineral. The aim of the studies carried out in the ŁUKASIEWICZ Research Network - Foundry Research Institute is to explore the possibility of using minerals coming from Polish deposits. The article outlines the basic properties of hybrid bentonites, which are a mixture of bentonite clay called beidellite, originating from overburden deposits of the Turoszów Mine, and foundry bentonite from one of the Slovak deposits. As part of the physico-chemical tests of minerals, measurements included in the PN-85/H-11003 standard, i.e. montmorillonite content, water content and swelling index, were carried out. Additionally, the loss on ignition and pH chemical reaction were determined. Based on the thermal analysis of raw materials, carried out in the temperature range from 0 to 1000⁰C, changes occurring in these materials during heating, i.e. thermal stability in contact with liquid metal, were determined. Examinations of the sand mixture based on pure clay and bentonite and of the sand mixture based on hybrid bentonites enabled tracing changes in permeability, compressive strength and tensile strength in the transformation zone as well as compactability referred to the clay content in sand mixture. Selected technological and strength parameters of synthetic sands are crucial for the foundry, because they significantly affect the quality of the finished casting. Based on the analysis of the results, the optimal composition of hybrid bentonite was selected.