24 KB606 KB23 KB200020242006Berginc, BoštjanKampuš, ZlatkoŠuštaršič, Borivojletnik:40številka:56 stranistr. 193-198ISSN:1580-2949COBISSID:577194URN:URN:NBN:SI:doc-L9EVNBDRenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijebrizganjemehanske lastnostimikrostrukturanerjavno jeklosintranjeThe influence of MIM and sintering-process parameters on the mechanical properties of 316L SS|Metal injection moulding (MIM) is a relatively new and promising technology for the mass production of small, complex near-net-shape products. The dimensions, tolerances and mechanical properties of MIM products are influenced by the process parameters of injection moulding, as well as by the sintering. The mechanical properties primarily depend on the sintering density and microstructure. However, the process parameters of the injection moulding must not be neglected. This investigation showed that the appropriate mechanical properties of MIM products can be obtained. However, they are drastically reduced if inappropriate injection moulding and sintering conditions are selected. An incomplete debinding process results in residual carbon, which hinders the sintering. High-temperature vacuum sintering causes the evaporation of volatile elements (chromium, manganese), resulting in an increased near-surface porosity. The formation of a hard and brittle sigma phase is controlled by the cooling rate after sintering. The ceramic supports can react with the sintered steel. In this paper the influence of injection-moulding and sintering parameters on the mechanical properties of sintered material is presented and discussedTehnologija brizganja kovinskih prašnatih materialov (MIM) je relativno nova in je primerna predvsem za masovno izdelavo kompleksnih izdelkov visoke natančnosti. Tako na dimenzije (tolerance) kot na mehanske lastnosti izdelkov MIM imajo vpliv procesni parametri brizganja in sintranja. Mehanske lastnosti so predvsem odvisne od gostote po sintranju in mikrostrukture. Hkrati pa se ne sme zanemariti vpliva procesnih parametrov brizganja. Raziskave so pokazale, da se lahko z MIM-postopkom dosežejo primerne mehanske lastnosti izdelkov, ki pa se izrazito poslabšajo, če so izbrani neprimerni pogoji sintranja in brizganja. Rezultat nedokončanega procesa odstranjevanja veziva je zaostali ogljik, ki zavira sintranje. Visokotemperaturno vakuumsko sintranje povzroči izhlapevanje nekaterih elementov (kroma, mangana) in posledični(!) povečano podpovršinsko poroznost. Nastanek krhke sigma-faze se lahko nadzoruje s hitrostjo ohlajanja po sintranju. Keramične podpore lahko reagirajo s sintranim jeklom. V tem prispevku je prikazan in pojasnjen vpliv parametrov brizganja in sintranja na mehanske lastnostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije