Silicone-coated alumina powders by the emulsion technique

✍ Scribed by L. J. Neergaard; M. B. Nawaz; Y. Tong; M. Jones; J. Cesarano

• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 609 KB
• Volume: 31
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00355861

✦ Synopsis

Alumina powders were prepared using an emulsion technique to chemically bond silanol-terminated poly dimethylsiloxane (PDMS or silicone) to the surface of alumina powders. Stable aqueous emulsions of silicone were prepared using Tween-80 surfactant. Transmission optical microscopy was used to measure the oil-droplet and coated-particle sizes. Fourier transform-infrared spectroscopy was used to quantify bonding between the silicone and the AI203. Coated powders were dry-pressed, and PDMS was compared to paraffin for dry-pressing behaviour and green strength. Densification studies were made on powders. X-ray diffraction and scanning electron microscopy were used to characterize the sintered ceramic.