研究目的
To improve the strength and toughness of transparent polycrystalline ceramics by engineering surface compression through the application of functional, low thermal-expansion yttria coatings and thermal treatment.
研究成果
The study successfully demonstrated a method to toughen transparent ceramics by inducing surface compression through yttria coatings and thermal treatment, significantly increasing fracture toughness and, in some cases, light transmittance. This approach has potential for applications requiring damage-resistant transparent materials.
研究不足
The technique's applicability may be limited by the need for compatible substrate and coating materials that do not adversely affect optical properties during thermal treatment. The study is a proof-of-concept, and further research is needed to optimize for real-world applications.
1：Experimental Design and Method Selection
The study involved applying yttria coatings to yttria-stabilized zirconia (YSZ) substrates using electron-beam physical vapor deposition (EB-PVD) followed by thermal treatment to induce surface compression.
2：Sample Selection and Data Sources
Transparent YSZ substrates were made from 8 and 10 mol% YSZ powders, processed through cold-pressing, sintering, and hot isostatic pressing to achieve optical transparency.
3：List of Experimental Equipment and Materials
Equipment included a cold-isostatic press, sintering furnace, hot isostatic press, EB-PVD system, spectrophotometer, and various microscopy and XRD equipment. Materials included YSZ powders and yttria for coatings.
4：Experimental Procedures and Operational Workflow
Substrates were prepared, coated with yttria, and thermally treated. Characterization included optical and electron microscopy, XRD for phase and stress analysis, and mechanical testing.
5：Data Analysis Methods
Residual stress was determined using the sin2ψ method. Fracture toughness was calculated from indentation cracks using the Anstis relation. Optical properties were measured using spectrophotometry.
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