The Ti3SiC2/Al2O3 coatings were prepared by plasma spraying process for the microwave absorption application. The coatings showed a dense structure with a few pores and unmelted region, and the Ti3SiC2 distributes uniformly in the coatings. The XRD was used to identify the phase composition of the coatings. The results indicated that the as-sprayed Ti3SiC2/Al2O3 coatings were composed of α-Al2O3 and γ-Al2O3, Ti3SiC2, TiC and Ti5Si3. The TiC and Ti5Si3 phases resulted from the Ti3SiC2 decomposition during the plasma spraying process. The complex permittivity of Ti3SiC2/Al2O3 coatings enhanced significantly with increasing the Ti3SiC2 content. When the Ti3SiC2 content was 20 wt. % and the coating thickness was 1.3 mm, the RL value of the coating can reach a minimum of − 24.4 dB at 11.1 GHz and RL value ≤ − 10 dB bandwidth in the frequency range of 10.1–12.4 GHz. Spherical instrumented scratch had been carried out on the Ti3SiC2/Al2O3 coatings to investigate the single-point abrasive wear behavior. Typical brittle fracture such as microcracks in the residual groove and grain dislodgement was observed in Ti3SiC2/Al2O3 coatings.

中文翻译：

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等离子喷涂制备Ti3SiC2/Al2O3涂层的高性能吸波性能

Ti3SiC2/Al2O3涂层采用等离子喷涂工艺制备，用于微波吸收应用。涂层呈致密结构，有少量气孔和未熔区，Ti3SiC2 均匀分布在涂层中。XRD用于确定涂层的相组成。结果表明，喷涂态的Ti3SiC2/Al2O3涂层由α-Al2O3和γ-Al2O3、Ti3SiC2、TiC和Ti5Si3组成。TiC 和 Ti5Si3 相是由等离子喷涂过程中 Ti3SiC2 分解产生的。Ti3SiC2/Al2O3涂层的复介电常数随着Ti3SiC2含量的增加而显着提高。当 Ti3SiC2 含量为 20 wt. %，涂层厚度为 1.3 mm，涂层的 RL 值在 11 时可达到最小值 - 24.4 dB。1 GHz 和 RL 值 ≤ − 10 dB 带宽，频率范围为 10.1–12.4 GHz。对 Ti3SiC2/Al2O3 涂层进行了球形仪器划痕以研究单点磨粒磨损行为。在 Ti3SiC2/Al2O3 涂层中观察到典型的脆性断裂，例如残留凹槽中的微裂纹和晶粒移位。