NiFe2O4 Ceramic U-shaped Sleeve Prepared by Slip Casting and Pressureless Sintering

doi:10.15541/jim20190359

Abstract

Abstract:

Slip casting and pressureless sintering were used to produce NiFe₂O₄ ceramic U-shaped protection sleeves for thermocouple in aluminum electrolysis. The stability of slurry, sintering behavior of green body as well as the temperature measuring performances, were investigated in detail. The Zeta potential of slurry was improved effectively by adding 10wt% NiFe₂O₄ nanopowders and 5wt% nano-binder, and the slurry possessed better sedimentation stability when pH was in the range from 10.0 to 11.0. Green bodies began to shrink significantly when the sintering temperature rising to 1100 ℃. The linear shrinkage and linear shrinkage ratio increased with temperature, and the linear shrinkage ratio reached its maximum at 1300 ℃. The sintering activation energy of the initial stage was 295.11 kJ·mol ^-1, and the main transport mechanisms were volume diffusion and grain boundary diffusion. The temperature testing results showed that the assembled thermocouple with NiFe₂O₄ ceramic protection sleeves worked well with timely response to temperature variation, as well as good resistance to thermal shock and corrosion from melt salts, with the prospect of industrial temperature measurement applications in an aluminum reduction cell.

Key words: slip casting, NiFe₂O₄, stability, sintering, corrosion

CLC Number:

TQ174

ZHANG Zhigang,LU Xiaotong,LIU Jinli. NiFe₂O₄ Ceramic U-shaped Sleeve Prepared by Slip Casting and Pressureless Sintering[J]. Journal of Inorganic Materials, 2020, 35(6): 661-668.

Figures/Tables 12

Fig. 1 Effects of NiFe2O4 nanopowder and nano-binder content on Zeta potential and viscosity, respectively

Fig. 2 Variation of Zeta potential as a function of pH for slurry

Table 1 Particle size distribution in different positions for the same green body

Position	Particle size/μm
Position	D₁₀	D₅₀	D₉₀
Slurry	0.45	2.51	5.35
Top_Ⅰ	0.46	2.51	5.33
Top_Ⅱ	0.45	2.52	5.34
Middle_Ⅰ	0.46	2.52	5.36
Middle_Ⅱ	0.46	2.53	5.34
Bottom_Ⅰ	0.46	2.52	5.36
Bottom_Ⅱ	0.46	2.52	5.34

Fig. 3 Variations of linear shrinkage and shrinkage rate as functions of sintering temperature for green body

Fig. 4 Curves of ln(ΔL/L0)T versus lnC at sintering

Table 2 Values of slope and linear regression coef?cient (CR) of relationship between ln(ΔL/L0)T and lnC under different temperatures

T/℃	-1/(m+1)	C_R
1150	-0.396	0.995
1175	-0.401	0.998
1200	-0.403	0.990
1225	-0.397	0.991
1250	-0.396	0.994
Average	-0.399	—

Fig. 5 Curves of ln[(ΔL/L0)/T] versus 1/T during sintering

Table 3 The values of slope (a) and linear regression coef?cient (CR) of relationship between ln[(ΔL/L0)/T] and 1/T at different heating rates

Heating rate/(K·min^-1)	a	C_R
5	-14049	0.990
10	-14165	0.987
20	-14279	0.985
Average	-14164	—

Fig. 6 SEM images and relative densities of samples sintered at different temperatures

Fig. 7 Temperature changes of different thermocouples in the temperature rising and falling process

Fig. 8 Distribution diagrams of F element in the surfaces of NiFe2O4 ceramics and Ni contents in electrolysis after corroded different periods

Fig. 9 Picture of assembled thermocouple and SEM image of NiFe2O4 ceramic sleeve

References 35

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NiFe₂O₄ Ceramic U-shaped Sleeve Prepared by Slip Casting and Pressureless Sintering

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