Preparation of high-entropy nitride ceramics (TiVCrNbZr_1-x)N_y by introducing nitrogen vacancies

Figures & data

Figure 1. The synthesis of TiN_0.3, sintering synthesis and performance testing flowchart.

Figure 2. XRD data of five transition metal nitrides under Cu Kα radiation after SPS at different temperatures.

Table 1. Weight percentage of ZrO₂ at different temperatures.

Temperature/℃	1400	1500	1600	1700	1800
Content/wt%	12.2	10.6	8.7	5.2	5.8

Figure 3. SEM schematic of SPS sintered samples at different temperatures: A: S1600°C, B: 1400°C, C: 1500°C, D: 1600°C, E: 1700°C, F: 1800°C.

Figure 4. EDS energy spectrum of (TiVCrNbZr_1-x)N_y-xZrO₂ synthesized at 1700°C.

Figure 5. Point scanning of small particle point 1 in (A): (B) elemental content distribution map, (C) spectrograms.

Table 2. Elemental content under EDS surface scanning at different sintering temperatures.

Element	Atomic percentage content of different temperatures/%
	1400°C	1500°C	1600°C	1700°C	1800°C
Ti	7.20	9.27	7.21	8.23	7.95
v	8.38	10.61	8. 13	9.66	8.99
Cr	10.33	10.31	8.67	9. 14	8.42
Zr	10.97	10.97	9.81	10.20	9.36
Nb	9.10	10.66	8.88	9. 19	9.42
N	44.51	37.36	46.93	44.60	48.11
0	9.51	10.82	10.37	8.98	7.75

Figure 6. TEM analysis of the 1700°C samples: (A) BF-STEM image of the samples; (B) Spectral Array of Electron Diffraction (SAED) image under the [010] crystallographic band axis; (C) High Resolution Transmission Electron Microscopy (HRTEM) image; (D) and (E) IFFT images of the FCC phase and the ZrO₂ phase, respectively.

Figure 7. Schematic diagram of flexural strength, fracture toughness and hardness of samples at different temperatures.