Strong Sintered Miserite Glass-Ceramics

• Published in: Journal of the American Ceramic Society Vol. 82; no. 9; pp. 2523 - 2528
• Main Authors: Pinckney, Linda R., Beall, George H., Andrus, Ronald L.
• Format: Journal Article
• Language: English
• Published: Westerville, Ohio American Ceramics Society 01.09.1999; Blackwell
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Chemical industry and chemicals; Crystals; Exact sciences and technology; Fluorapatite; Fracture toughness; Glass ceramics; Glasses; Microstructure; Nucleation; Sintering; Strength; Chemical stability; Lanthanum Oxides; Rupture modulus; Aluminium Oxides; Boron Oxides; Phosphorus Oxides; Thermal expansion coefficient; Crystal nucleation; Zirconium Oxides; Calcium Fluorides; Chemical properties; Tenacity; Cerium Oxides; Scanning electron microscopy; Crystallization; Mechanical properties; X ray diffraction; Titanium Oxides; Thermal properties; Potassium Oxides; Niobium Oxides; Yttrium Oxides; Sintering; Preparation; Silicon Oxides; Calcium Oxides; Microstructure; Glass ceramics
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.1999.tb02114.x

Strong and tough glass‐ceramic materials based on the complex chain silicate miserite (KCa5open square(Si2O7)(Si6O15)F) have been prepared using standard frit sintering and internal nucleation processes. The miserite may be accompanied by crystals of fluorite, cristobalite, xonotlite, a canasite‐like phase, and fluorapatite. The highly crystalline glass‐ceramics have a microstructure composed primarily of interlocked, lath‐ or log‐shaped miserite crystals with pronounced cleavage planes. This microstructure provides abraded flexural strength values as high as 235 MPa (34 000 psi) and fracture toughness values >3.0 MPa·m1/2. These strength and toughness values are quite high for a glass‐derived material. Miserite glass‐ceramics may be useful for many applications in which such strength and toughness are desired.