Effect of La, Y Additions on ZrO2-mullite Nano-composite Ceramics by In-situ Controlled Crystallizing from Si-Al-Zr-O Amorphous Bulk

doi:10.15541/jim20150142

Abstract

Abstract:

Effects of Y₂O₃ and La₂O₃ doping on ZrO₂-mullite nano-composite ceramics, prepared by in-situ controlled crystallizing from the Si-Al-Zr-O amorphous bulk, were revealed by means of DSC, XRD, SEM and TEM technologies. The results indicate that the addition of Y₂O₃ and La₂O₃ (Y₂O₃ <1.8wt% and La₂O₃ <4wt%) can effectively reduce the melting temperatures of Si-Al-Zr-O based amorphous, limit the devitrification phenomenon and is beneficial for the formation of amorphous during cooling process, without changing the main crystalline phase precipitation. For Y₂O₃ single doping, Y is mainly dissolved in the zirconium oxide, stabilizes t-ZrO₂, and inhibits precipitation of the cordierite, and exerts little effect on the grain size. For both Y₂O₃ and La₂O₃ mixed doping, Y and La mainly locate in the glass phase, strengthen the grain boundary, of which La promotes the grain growth of ZrO₂ and mullite. The appropriate doping amount of Y₂O₃ and La₂O₃ should be in the range of 1.0wt%-2.0wt% and 0.6wt%-1.2wt%, respectively.

Key words: doping, amorphous, microstructure changes

CLC Number:

TQ171

TAN Xiao-Ping, QI Li-Ping, LIANG Shu-Quan. Effect of La, Y Additions on ZrO₂-mullite Nano-composite Ceramics by In-situ Controlled Crystallizing from Si-Al-Zr-O Amorphous Bulk[J]. Journal of Inorganic Materials, 2016, 31(1): 47-52.

Figures/Tables 10

Table 1 Composition of the samples in the study(wt%)

No.	SiO₂	Al₂O₃	ZrO₂	Y₂O₃	La₂O₃	MgO+CaO
Z3	35	40	20	0	0	5
ZY1	35	40	20	0.5	0	5
ZY2	35	40	20	1.0	0	5
ZY3	35	40	20	2.0	0	5
ZY4	35	40	20	4.0	0	5
ZYL0(ZY2)	35	40	20	1.0	0	5
ZYL1	35	40	20	1.0	0.6	5
ZYL2	35	40	20	1.0	1.2	5
ZYL3	35	40	20	1.0	1.8	5

Fig. 1 DSC curves of the samples with and without dopants

Table.2 Top temperatures on the DSC curves of samples with the additives of La2O3 and Y2O3

No.	T_p1/℃	T_p2 /℃
Z3	1007	1174
ZY1	1004	1172
ZY2	1007	1174
ZY3	1009	1170
ZY4	1015	1167
ZYL1	1008	1172
ZYL2	1006	1170
ZYL3	1004	1168

Fig. 2 XRD patterns of the samples with different Y2O3 contents (a) 0; (b) 0.5; (c) 1.0; (d) 4.0

Fig. 3 TEM image of the ZY2 sample (a) and EDS patterns of area 1 and area 2 (b) in (a)

Fig.4 XRD patterns of the samples with different La2O3 contents (a) 0; (b) 0.6; (c) 1.2

Fig. 5 TEM image of the ZYL1 sample (a) and EDS patterns of area 1 and area 2 (b) in (a)

Fig. 6 SEM images of the samples without doping (a), with 1.0wt% Y2O3 (b) and with 1.0wt%Y2O3+0.6wt%La2O3 (c) doping

Fig. 7 Fracture toughness (a) and flexural strengths (b) of ZY samples as a function of the content of Y2O3

Fig. 8 Fracture toughness (a) and flexural strengths (b) of ZY samples as a function of the content of La2O3

References 19

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Effect of La, Y Additions on ZrO₂-mullite Nano-composite Ceramics by In-situ Controlled Crystallizing from Si-Al-Zr-O Amorphous Bulk

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