Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: porous metallic materials

Sortuj według:

Ogranicz wyniki do:

Research of influence of the perforation form in metal products on their thermal conductivity

Pavlenko A., Koshlak H., Cheylitko A.

Journal of New Technologies in Environmental Science

2017

Vol. 1, nr 3

108--112

The porosity in metals has been perceived only as a negative factor for a long time, which reduces the mechanical properties and tightness of the material. For preventing and blocking the negative effects of porosity in metals were dedicated a lot of scientific works, some of them are used in present time [1-3]. However, due to numerous experiments the positive factors of porosity in metals were opened. These factors are the combination of physical and mechanical properties such as high stiffness in combination with a very low density (low specific gravity) and/or high gas permeability combined with a high/low thermal conductivity [4]. Thanks to this, porous metals have received a new stage of evolution. Now porosity is being regarded not only as a negative effect of imperfection technology of making metal products, but also as a way to produce a material with unique properties. Globally porous metal materials can be divided into three categories: cellular metals [5]; metallic foams [6] and porous metals [7]. Products from such materials are used in the automotive industry as structural elements; in the aerospace industry as titanium and aluminum sandwich panels; in shipbuilding as a body for passenger vessels; in medicine as implants in humans [8-11]. From the field of use such products must conform to the following parameters: porosity, gas permeability, thermal conductivity, electrical conductivity, density, sound absorption, etc. There are a lot of methods of creation of porous metallic materials today. But complete method of controlling thermal properties of materials by changing parameters of porosity is still no. For creating such method we need to know what factors, under what conditions and with what degree are influence on the required material's parameters. The aim of this work is to investigate the influence of a combination of factors (form, size and position of pores) in the porous metal material on the thermal conductivity.

Weryfikacja doświadczalna wybranych właściwości odkształcanych metalicznych materiałów porowatych

Galanty M.

Rudy i Metale Nieżelazne

2002

R. 47, nr 5

242-246

Przedstawiono uwagi na temat właściwości materiałów porowatych otrzymywanych na bazie proszków metali podczas ich odkształcania na zimno. Omówiono możliwości oceny stopnia zagęszczenia i porowatości na przykładzie rozpylanego proszku aluminium RALI. Pod uwagę wzięto różne fazy procesu od momentu zasypywania do matryc, poprzez wstępne prasowanie i dalej wyciskanie na zimno bez stosowania środków poślizgowych.

The author calls the reader's attention to the properties of porous materials obtained on the base of metal powders, during their cold deformation. The possibility of evaluation of the consolidation degree and porosity are described on example of sprayed aluminium powder RAL1. Several phases of the process are taken into consideration, from the moment of filling the matrix, through pre-pressing and further cold extrusion, without application of lubricants.