SHS-assisted Shock Sintering and Characterization of TiB2/B4C Composite Ceramics

doi:10.12382/bgxb.2023.0078

Abstract

Abstract:

In order to explore the efficient and low-cost preparation method of high hardness composite ceramics, the titanium diboride/boron carbide (TiB₂/B₄C) composite ceramics with a thickness of about 1 cm and a diameter of about 5cm was fabricated by SHS-assisted shock sintering method. The results of phase and microstructure analysis show that TiB₂ phase and B₄C phase are evenly distributed in the sintered samples, and dense micron particles are observed in the cross section. The density and hardness of the samples prepared by this method are relatively high. The density ranges from 90% to 93% with the change of shock pressure, and the corresponding average Vickers hardness ranges from 16.64GPa to 17.35GPa. The analysis of the microstructures and densities of the recovered samples under different conditions show that the shock pressure and the pre-detonation temperature have an important effect on the consolidated quality of TiB₂/B₄C composite ceramics. When the shock pressure is 40GPa and the temperature is 1500℃, the density of sintered sample is 93%. The shock pressure or shock time should be increased to improve the sintering quality. The results show that SHS-assisted shock sintering method is an efficient and low-cost preparation method for high hardness composite ceramics.

Key words: TiB₂/B₄C, composite ceramic, self-propagating high temperature synthesis, explosive sintering, microstructure

CLC Number:

TB33

LI Yunfei, GAO Xin, CHEN Pengwan, LIU Kaiyuan. SHS-assisted Shock Sintering and Characterization of TiB₂/B₄C Composite Ceramics[J]. Acta Armamentarii, 2024, 45(1): 26-34.

Figures/Tables 12

Fig.1 Schematic diagram of explosive sintering device

Table 1 Sintering experimental conditions

实验编号	装药高度/mm	炸药爆速/ (m·s^-1)	起爆延迟时间/s
1	200	3200	4
2	150	3200	4
3	200	3200	6
4	150	3200	6

Table 2 Parameters used in impedance matching method

材料	密度ρ/ (g·cm^-3)	材料常数C/ (km·s^-1)	材料常数 S	不同药高飞片飞行速度 w/(km·s^-1)
材料	密度ρ/ (g·cm^-3)	材料常数C/ (km·s^-1)	材料常数 S	200mm	150mm
45号钢	7.85	4.567	1.47	1.708	1.554
TiB₂/B₄C (50%致密度)	1.875	2.38	1.15

Fig.2 Impedance matching method to calculate the shock pressure

Table 3 Parameters in sintering experiment

实验编号	T₀/K	p/GPa	p_s/GPa	致密度/%
1	1800	39.02	5.47	93.00
2	1800	34.86	4.35	91.30
3	1400	39.02	5.47	93.00
4	1400	34.86	4.35	90.00

Fig.3 Photos of sintered samples

Fig.4 XRD pattern of TiB2/B4C composite ceramics (Sample 1)

Fig.5 SEM image of loose products obtained using self-propagating high temperature synthesis

Fig.6 SEM images of TiB2/B4C composite ceramic samples after polishing under different experimental conditions (left: 500×; right: 2000×)

Fig.7 Element distribution on cross section of TiB2/B4C composite ceramics

Table 4 Atomic ratio obtained by EDS analysis of sintered sample

原子比/%	Ti	B	C
生坯原子比	19.44	72.23	8.33
烧结样品原子比	12.58	62.26	25.16

Fig.8 Vickers hardness of sintered TiB2/B4C composite ceramic samples under different experimental conditions

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SHS-assisted Shock Sintering and Characterization of TiB₂/B₄C Composite Ceramics

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