The largest outputs of rare earth mining are the low-value byproducts cerium and lanthanum, which burden supply chains because they must be separated from more desirable earths used in magnet production. Promoting demand for lanthanum can potentially diversify economics improve chain stability all elements. A promising avenue increasing byproduct element is their use aluminum alloys; an applica...

The development of coarse‐grained refractory composites combining ceramics with metals provides new approaches for high‐temperature applications. In particular, Nb‐Al 2 O 3 are widely interested due to their promising functional properties such as high thermal shock resistance, low shrinkage and good electrical conductivity. order identify release the potential these materials in advanced appli...

In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, alkaline fluoride NaF and cryolite Na3AlF6 powders were studied. Both physical and chemical properties are known to influence wetting and corrosion behavior. This paper devoted to determine the influence of alkaline fluoride and cryolite added to andalusite based castable on the reaction with a...

INTRODUCTION Base metals have a wide use in casting methods. Sometimes they are reused in laboratories which may have an adverse effect on the restoration marginal integrity. This study aimed to investigate the effect of recasting of alloys on marginal integrity of restorations. MATERIALS AND METHODS Models with two types of finishing lines shoulder bevel 45° and shoulder 135° were produced a...

We describe four criteria for the selection of alloying elements capable of producing castable, precipitationstrengthened Al alloys with high-temperature stability and strength: these alloying elements must (i) be capable of forming a suitable strengthening phase, (ii) show low solid solubility in Al, (iii) low diffusivity in Al, and (iv) retain the ability for the alloy to be conventionally so...

The use of bulk metallic glasses (BMGs) as the flexspline in strain wave gears (SWGs), also known as harmonic drives, is presented. SWGs are unique, ultra-precision gearboxes that function through the elastic flexing of a thin-walled cup, called a flexspline. The current research demonstrates that BMGs can be cast at extremely low cost relative to machining and can be implemented into SWGs as a...

Alumina-magnesium castable refractories are used for the inner walls of molten steel ladles. The main cause damage to these is thermal shock caused by rapid temperature changes during loading and unloading steel. Therefore, resistance coefficient R'''' a parameter that expresses shock, evaluation effective fracture energy important improving R''''. In this refractory, CaO·6Al2O3 (CA6) formed fr...