Intermetallic bonded titanium carbide cermets are of interest due to the high hardness, high-temperature strength, and corrosion resistance. Their thermal expansion coefficient can also be close to cast iron's, which enhances their utility in mechanisms where thermal expansion differences must be minimized. In order for these cermets to be utilized by the automotive and diesel industries, a cost-effective production method must be developed. A formation process based on low-pressure powder injection was developed and studied as a potential low-cost alternative to conventional manufacturing methods. Test rods of nickel aluminide, nickel aluminide-iron, nickel-chromium, and nickel-chromium-iron bonded 60 vol.% TiC were formed using both pre-alloyed and reaction sintered powders. Bimodal feedstocks showed high defect rates that were attributed to phase separation within the feedstock and particle migration during binder removal. Feedstocks containing a very broad particle size distribution of varied morphology were very well suited for low-pressure powder injection molding.
Low-pressure injection molding of intermetallic-TiC cermets
2003
6 Seiten, 2 Bilder, 2 Tabellen, 8 Quellen
Conference paper
English
Titancarbid , Cermet , intermetallische Verbindung , Härte , Temperaturbeständigkeit , Korrosionsbeständigkeit , thermischer Ausdehnungskoeffizient , Automobilindustrie , Dieselmotor , Pulvereinblasen , Niederdruck , Nickelaluminid , Nickelverbindung , Nickelchromlegierung , vorlegiertes Pulver , Reaktionssintern , Phasentrennung , Migration , Bindemittel , Partikelgröße
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