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Struktura kompozytowych odlewów otrzymanych odśrodkowo

Dolata-Grosz A., Wieczorek J., Dyzia M., Śleziona J.

Kompozyty

2001

R. 1, nr 2

141-143

Zastosowanie odlewania odśrodkowego w celu wytworzenia kompozytów zbrojonych cząstkami korundu i węglika krzemu zapewnia warstwowe rozmieszczenie zbrojenia w odlewie. W artykule przedstawiono rozkład zbrojenia (Al2O3 i SiC) w osnowie stopu AK12 oraz struktury uzyskanych tulei kompozytowych.

In response to modern industry requirements scientist's attention turns toward composite materials which join all the undermentioned qualities: good sliding, high strength, high wear and abrasion resistance. The example of such kind of materials are composites on aluminum alloy matrix with ceramic reinforcement. Not only the kind of reinforcement that is used influences materials utilisable qualities but also its distribution. Many parts of the machines (pistons, sleeve) need local distribution of the reinforcement. One of the solutions that enables increasing the quantity of the reinforcement in superficial regions is casting them into spinning forms. This technology makes possible forming the structure of the materials with any reinforcement distribution. In the article there is presented the analysis of the composite AK12+Al2O3 and AK12+SiC acquired through the centrifugal casting. The process was carried on by means of two rotational speeds: 750 and 3000 r.p.m. For alumnium matrix reinforcement alumina and silicon carbide particles were used at 30, 50 and 100 urn size. Tens casting with different reinforcement distribution were obtained. According to process parameters and particles size internal (Fig. 4) and external (Fig. 6) reinforcement was obtained. During sleeve casting from suspension containing in its volume three reinforcement granulation's (30, 50,100 um) clear particle separation according to their quantity was observed and two layers - external and internal (Fig. 8) - were obtained. Considering acquired results it was found that there is a possibility of projecting materials on the way of centrifugal casting. However there is a necessity of further researches on influence of the generation parameters process on the laminar structure of the sleeve.