Effect of Monolithic LaB6 on the Ablation Resistance of ZrC/SiC Coating Prepared by Supersonic Plasma Spraying for C/C Composites

doi:10.1016/j.jmst.2016.06.019

Abstract

Abstract:

Ablation resistance of monolithic LaB₆-doped ZrC coating for SiC-coated carbon/carbon composites by supersonic atmospheric plasma spray was investigated under an oxyacetylene torch with a heat flux of 4.18 MW/m². Result shows that ZrC coating with 10 vol.% LaB₆ has a good ablation resistance compared with pure ZrC, ZrC with 20 vol.% LaB₆ and SiC-doped ZrC coating. After ablation for 15 s, the weight is increased by 1.12 mg/s. The good ablation resistance is ascribed to the formation of a stabilized scale which consists of protective La₂Zr₂O₇-containing molten phase and ZrO₂ particles keeping the integrity of the coating.

Key words: Ceramic coating, C/C composites, Ablation performance

Jia Yujun,Li Hejun,Li Lu,Fu Qiangang,Li Kezhi. Effect of Monolithic LaB₆ on the Ablation Resistance of ZrC/SiC Coating Prepared by Supersonic Plasma Spraying for C/C Composites[J]. J. Mater. Sci. Technol., 2016, 32(10): 996-1002.

Figures/Tables 12

Table 1 Detailed spray parameters for the doped coatings

Table 1 Detailed spray parameters for the doped coatings">

Content	Parameters
Spraying current (A)	400-410
Spraying voltage (V)	125-140
Primary gas Ar (L/min)	75
Carrier gas Ar (L/min)	10
Second gas H₂ (L/min)	5-14
Powder feed rate (g/min)	25
Spraying distance (mm)	100
Nozzle diameter (mm)	5.5

Fig. 1. Surface SEM (a) and cross-section BSE (b) images of ZLB10-coated sample. Inset of figure refers to the enlarged view of the surface SEM image.

Fig. 2. XRD patterns of various coatings before ablation and the agglomerated ZS and ZLB10 powders.

Fig. 3. Optical photos of samples ZLB0 (a), ZLB10 (b), ZLB20 (c), and ZS (d) after ablation.

Fig. 4. Enlarged views of the destructed areas in the coating surface after ablation: (a) ZLB0, (b) ZLB20 and (c) ZS. Inset of figure refers to the EDS analysis of Spot 1 marked in (b).

Fig. 5. Results of the mass variation rates of the coated samples after ablation.

Fig. 6. SEM images on the surface center of (a) ZLB0, (b) ZLB10, (c) ZLB20, and (d) ZS after ablation. Inset of figure refers to the EDS analysis of Spot 2 marked in (d).

Fig. 7. XRD patterns of the ablated surface of the coatings.

Fig. 8. BSE images of the hump on the cross-section (a) and enlarged views and EDS of the corresponding areas of ZS (b) and (c) after ablation.

Fig. 9. High magnification SEM image and the EDS result on the surface center of ZLB10 after ablation.

Fig. 10. (a) High magnification BSE image and the EDS result on the cross-section center of ZLB10-coated sample, (b) enlarged view of area A and the EDS result, and (c) enlarged view of area B and the EDS result.

Fig. 11. Illustration of the ablation mechanism of LaB6 containing coatings.

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Effect of Monolithic LaB₆ on the Ablation Resistance of ZrC/SiC Coating Prepared by Supersonic Plasma Spraying for C/C Composites

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