Mechanical and thermal properties of RE4Hf3O12 (RE=Ho, Er, Tm) ceramics with defect fluorite structure

doi:10.1016/j.jmst.2019.04.025

Abstract

Abstract:

The thermal and environmental barrier coatings (T/EBC) are technologically important for advanced propulsion engine system. In this study, RE₄Hf₃O₁₂ (RE=Ho, Er, Tm) with defect fluorite structure was investigated for potential use as top TBC layer. Dense pellets were fabricated via a hot pressing method and the mechanical and thermal properties were characterized. RE₄Hf₃O₁₂ (RE=Ho, Er, Tm) possessed a high Vickers hardness of 11 GPa. The material retained high elastic modulus at elevated temperatures up to 1773 K, which made it attractive for high temperature application. The coefficient of thermal expansion (CTE) of RE₄Hf₃O₁₂ (RE = Ho, Er, Tm) laid in the range between 7 × 10^-6 K^-1 to 10 × 10^-6 K^-1 from 473 K to 1673 K. In addition, the rare earth hafnates exhibited lower thermal conductivity which rendered it a good candidate material for thermal barrier applications.

Key words: Rare earth hafnate, Thermal/environmental barrier coating, Mechanical property, Thermal property

Wanpeng Hu, Yiming Lei, Jie Zhang, Jingyang Wang. Mechanical and thermal properties of RE₄Hf₃O₁₂ (RE=Ho, Er, Tm) ceramics with defect fluorite structure[J]. J. Mater. Sci. Technol., 2019, 35(9): 2064-2069.

Figures/Tables 8

Fig. 1. XRD patterns of as-synthesized (a) F*-Ho4Hf3O12, (b) F*-Er4Hf3O12 and (c) F*-Tm4Hf3O12.

Fig. 2. Microstructures of polished and etched surfaces of (a) F*-Ho4Hf3O12, (b) F*-Er4Hf3O12 and (c) F*-Tm4Hf3O12 pellets.

Fig. 3. (a) Vickers hardness as a function of indentation load and (b) typical indentation morphology of sample under load.

Fig. 4. Temperature dependence of elastic modulus for F*-Ho4Hf3O12, F*-Er4Hf3O12 and F*-Tm4Hf3O12 and internal friction for F*-Tm4Hf3O12.

Fig. 5. (a) Comparison of room temperature flexural strength of F*/δ-RE4Hf3O12 (RE=Ho, Er, Tm, Yb, Lu) and fractured surface morphology of (b) F*-Ho4Hf3O12, (c) F*-Er4Hf3O12 and (d) F*-Tm4Hf3O12.

Fig. 6. (a) Linear thermal expansion and (b) thermal expansion coefficient of F*-Ho4Hf3O12, F*-Er4Hf3O12 and F*-Tm4Hf3O12 in temperature range 473-1673 K.

Table 1 Values of CTE of F*-RE4Hf3O12 in temperature range 473-1673 K.

Temperature (K)	Ho₄Hf₃O₁₂ (10^-6 K^-1)	Er₄Hf₃O₁₂ (10^-6 K^-1)	Tm₄Hf₃O₁₂ (10^-6 K^-1)
473	7.59	7.40	7.20
673	8.50	8.27	8.13
873	8.92	8.71	8.73
1073	9.23	8.95	8.97
1273	9.29	9.15	9.21
1473	9.51	9.49	9.57
1673	9.54	9.59	9.67

Fig. 7. (a) Heat capacity, (b) thermal diffusivity and (c) thermal conductivity for F*-Ho4Hf3O12, F*-Er4Hf3O12 and F*-Tm4Hf3O12. The thermal conductivity values of La2Zr2O7 [34], Gd2Zr2O7 [31], Yb2Zr2O7 [34], δ-Yb4Hf3O12 [17], δ-Lu4Hf3O12 [17], Zr3Y4O12 [32] and dense YSZ [33] are also included.

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Mechanical and thermal properties of RE₄Hf₃O₁₂ (RE=Ho, Er, Tm) ceramics with defect fluorite structure

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