Monazite Coatings On Fibres: 1, Effect Of Temperature And Alumina Doping On Coated-Fibre Tensile Strength

Monazite was continuously coated onto Nextel 720 fibres, using an aqueous precursor and in-line heat treatment at 900-1300 deg C. Some experiments were repeated with alumina-doped precursors. Coated fibres were heat-treated for 100h at 1200 deg C. Coatings were characterized by optical microscopy, scanning electron microscopy, and analytical transmission electron microscopy. Coated-fibre tensile strengths were measured by single-filament tensile tests. The precursors were characterized by X-ray diffractometry, differential thermal analysis/thermogravimetric analysis, and mass spectrometry.