Fabrication and Property of AlN-BN Composites by Hot Isostatic Pressing

doi:10.15541/jim20150501

Abstract

Abstract:

AlN-BN composites were fabricated by hot isostatic pressing (HIP) without sintering aid, using aluminum nitride (AlN) and boron nitride (BN) powders as raw materials. The effects of HIP temperature and pressure on microstructure and properties of composites with two different raw material ratios (molar ratio) were investigated. The results show that increasing amount of BN has little impact on densification, but decreases the hardness and thermal conductivity while increases the volume resistivity. The higher the density of the composite is, the higher thermal conductivity, volume resistivity and hardness are. The thermal conductivity and volume resistivity values conform the formula: . AlN-BN composites with the ratio of n_AlN:n_BN = 75:25 were prepared at 1600 ℃, 90 MPa and a dwell time of 3 h by HIP, achieving density of 98.03%, thermal conductivity of 77.29 W/(m·K) and a volume resistivity of 1.35 × 10¹⁵Ω·cm.

Key words: AlN-BN composite ceramics, HIP, thermal conductivity, volume resistivity

CLC Number:

TB332

PENG Xu, ZHU De-Gui, LI Yang-Xu, ZHOU Jia-Min, LV Zhen, GUO Peng-Chao. Fabrication and Property of AlN-BN Composites by Hot Isostatic Pressing[J]. Journal of Inorganic Materials, 2016, 31(5): 535-541.

Figures/Tables 10

Fig. 1 XRD patterns of AlN-BN composite ceramics

Table 1 Relative density and hardness of AlN-BN composite ceramics prepared by different HIP processes

n_AlN:n_BN	Sample number	Temperature/℃		Relative density/%	Vickers hardness/GPa
75:25	1#	1550	80	95.01±0.05	2.89±0.08
	2#	1550	120	96.21±0.03	3.15±0.13
	3#	1600	90	98.03±0.05	3.69±0.09
50:50	4#	1550	80	95.46±0.03	1.13±0.15
	5#	1550	120	96.70±0.06	1.65±0.12
	6#	1600	90	97.98±0.08	1.84±0.10

Fig. 2 SEM images of AlN (a) and BN powders (b)

Fig. 3 SEM morphologies and EDS patterns of AlN-BN composites (a) 2#; (b) 5#; (c) 3#; (d) 6#; (e) 3#EDS; (f) 6#EDS

Fig. 4 Thermal conductivity vs sample thickness curves of AlN - BN composite ceramics

Table 2 Thermal conductivity and volume resistivity of AlN-BN composite ceramics

Sample number	Thermal conductivity/ (W·m^-1·K^-1)	Volume resistivity/ (Ω·cm)
1#	57.39	8.40×10¹⁴
2#	68.10	1.10×10¹⁵
3#	77.29	1.35×10¹⁵
4#	40.21	7.73×10¹⁶
5#	40.11	9.15×10¹⁶
6#	51.65	1.18×10¹⁷

Fig. 5 The influence of the density of AlN-BN composite ceramics on thermal conductivity and volume resistivity

Fig. 6 Volume resistivity vs sample thickness curves of AlN-BN composite ceramics

Fig. 7 Theoretical and practical thermal conductivity of AlN-BN composite ceramics

Fig. 8 Theoretical and practical volume resistivity of AlN-BN composite ceramics

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