Fabrication and Mechanical Property of W-Y2O3 Composites and Graded material

doi:10.15541/jim20170353

Abstract

Abstract:

W-Y₂O₃ composite with the gradient variation of volume content of Y₂O₃was fabricated by pressureless sintering process. Phases and microstructure of W-Y₂O₃ composite were characterized. Fracture mechanism was explored by means of the measured results of mechanical properties and fracture morphology. Distribution of thermal stress in W-Y₂O₃ graded material during sintering is simulated by finite element method, while feasibility of composition content and structure of each layer are analyzed, then W-Y₂O₃ graded material is successfully fabricated by this process. The results show that the mechanical properties of W-Y₂O₃ composite decrease with the increment of volume content of Y₂O₃, which is mainly contributed to the effects of inherent strength of composed phase, porosity and grain size. Finally, faultless W-Y₂O₃ graded material with high quality of interface bonding can be fabricated by reasonable design of gradient layers.

Key words: W-Y₂O₃Graded Material, W-Y₂O₃ composites, Thermal stress, Mechanical property

CLC Number:

TB331

WANG Shi-Yang, FU Yu-Dong, CHEN Lei, WANG Yu-Jin. Fabrication and Mechanical Property of W-Y₂O₃ Composites and Graded material[J]. Journal of Inorganic Materials, 2018, 33(6): 596-602.

Figures/Tables 10

Table 1 Compositional and thickness designs of W-Y2O3 composite layers

Composite code	Composition/vol%		Thickness/mm
Composite code	W	Y₂O₃	Thickness/mm
WY1	82	18	0.5
WY2	69	31	0.5
WY3	57	43	1.0
WY4	44	56	1.0
WY5	34	66	1.0
WY6	25	75	1.0
WY7	17	83	1.0
WY8	6	94	2.0

Fig. 1 XRD patterns of W-Y2O3 composites

Table 2 The relative densities of W-Y2O3 composites

Materials code	Measured de- nsity/(g•cm^-3)	Density /%	Axial shrinkage/%	Radial shrinkage/%
WY1	16.679	99.5	19.8	14.6
WY2	14.657	98.3	20.0	13.7
WY3	12.934	98.1	19.8	12.5
WY4	10.899	96.3	20.3	11.5
WY5	9.226	93.3	20.0	12.2
WY6	7.916	92.1	20.0	10.7
WY7	6.879	92.4	20.1	10.3
WY8	5.347	91.1	19.7	9.9

Fig. 2 SEM images of W-Y2O3 composites(a) WY1; (b) WY3; (c) WY5; (d) WY7

Fig. 3 Flexural strength and elastic modulus of W-Y2O3 composites

Fig. 4 Fracture surface SEM images of W-Y2O3 composites(a) WY1; (b) WY3; (c) WY5; (d) WY7

Fig. 5 Mesh generation of W-Y2O3 graded material

Fig. 6 FEA results of thermal stress(a) Stress distribution patten; (b) Stress distribution curves

Fig. 7 Cross section SEM image of W-Y2O3 graded material

Fig. 8 Vickers hardness of W-Y2O3 graded materials at different positions

References 23

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Fabrication and Mechanical Property of W-Y₂O₃ Composites and Graded material

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