Two stage sintering behaviour of Er2O3 doped high performance ZnO varistors

Roy, Samarpita; Das, Debdulal; Roy, Tufan

doi:10.1016/j.jeurceramsoc.2021.04.009

Cited by 14 publications

(24 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The leakage current (I L ) was measured at 0.8×E B (1.0 mA), the leakage current density (J L ) was calculated by J L = I L /S, where S is the silver electrode area (Roy et al , 2021).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Bouchekhlal¹,

Boulesbaa

2022

View full text Add to dashboard Cite

Purpose The purpose of this paper is to investigate the effects of the sintering temperature on the microstructural, morphological and electrical characteristics of Zinc oxide (ZnO)-based varistors. Design/methodology/approach This study used a conventional method to design and produce ZnO varistors by sintering ZnO powder with small amounts of various metal oxides. Furthermore, the effect of sintering temperature on varistor properties of (Bi, Co, Cr, Sb, Mn)-doped ZnO ceramics was investigated in the range of 1280–1350 °C. Findings The obtained results showed an EB value of 2109.79 V/cm, a Vgb value of 0.831 V and a nonlinear coefficient (α) value of 19.91 for sample sintered at temperature of 1300 °C. In addition, the low value of tan δ at low frequency range confirmed that the grain boundaries created in 1300 °C sintering temperature were obviously good. Originality/value Based on the previous research on the ZnO-based varistors, a thorough study was carried out on these components to improve their electrical characteristics. Thus, it is necessary that those varistors have low leakage current and low value of dissipation factor to ensure their good quality. High breakdown fields and nonlinearity coefficients are also required in such kind of components. The effect of sintering temperature on the varistor properties of the new compositions (zinc, bismuth, manganese, chrome, cobalt, antimony and silicon oxides)-doped ZnO ceramics was studied in the range of 1280–1350 °C. Also, the microstructure and the phase evolution of the samples sintered at various temperatures (1280 °C, 1300 °C, 1320 °C and 1350 °C) were investigated according to X-ray diffraction and scanning electron microscope measurements.

show abstract

“…The leakage current (I L ) was measured at 0.8×E B (1.0 mA), the leakage current density (J L ) was calculated by J L = I L /S, where S is the silver electrode area (Roy et al , 2021).…”

Section: Methodsmentioning

confidence: 99%

“…The ZnO-based varistor is the leading electro-ceramic semiconductor which is one of the key components of different electric power systems and electronic circuits(Roy et al , 2021; Niu et al , 2021). As a fact, this device plays a vital role to protect the various circuits and systems from voltage surges (Meng et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Bouchekhlal¹,

Boulesbaa

2022

View full text Add to dashboard Cite

show abstract

“…For sintering the green compacts, single-stage sintering (SSS) ( Table S1 ) or two-stage sintering (TSS) ( Table S2 ) is carried out in air, with a sintering temperature (T s ) of 800–1300 °C for a dwell time of 0.5–8 h at T s , a low heating/cooling rate (HR/CR) of approximately 2–5 °C/min, and furnace cooling of the sintered MOVs to RT. Subsequently, the MOV discs are lapped and polished with SiC abrasive paper and diamond or Al 2 O 3 suspensions containing fine abrasive particles and a cooling lubricant [ 35 , 63 , 169 ] to obtain flat surfaces with a parallel-plane configuration.…”

Section: Preparation Of Mov Powders and Disc-shaped Movs From Zno-v ...mentioning

confidence: 99%

“…The TSS process follows similar steps to those of the SSS process. In the TSS process reported in [ 63 ], the first sintering temperature (T 1 of 1050 °C) is higher than the second one (T 2 = 750–800 °C), the dwell time (t 1 ) at T 1 is much lower (t 1 = 1/6 h) than the dwell time (t 2 ) at T 2 (t 2 = 2.5–40 h), the heating rate from RT to T 1 is 15 °C/min, the cooling rate from T 1 to T 2 is 30 °C/min, and the sintered MOVs are furnace-cooled to RT. A TSS process with T 1 < T 2 , or multistage sintering (MSS), is an alternative process for manufacturing MOVs.…”

Section: Preparation Of Mov Powders and Disc-shaped Movs From Zno-v ...mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Dopants and Processing Parameters on the Properties of ZnO-V2O5-Based Varistors Prepared by Powder Metallurgy: A Review

Lungu¹

2023

Materials

View full text Add to dashboard Cite

This article reviews the progress in developing ZnO-V2O5-based metal oxide varistors (MOVs) using powder metallurgy (PM) techniques. The aim is to create new, advanced ceramic materials for MOVs with comparable or superior functional properties to ZnO-Bi2O3 varistors using fewer dopants. The survey emphasizes the importance of a homogeneous microstructure and desirable varistor properties, such as high nonlinearity (α), low leakage current density (JL), high energy absorption capability, reduced power loss, and stability for reliable MOVs. This study investigates the effect of V2O5 and MO additives on the microstructure, electrical and dielectric properties, and aging behavior of ZnO-based varistors. The findings show that MOVs with 0.25–2 mol.% V2O5 and MO additives sintered in air over 800 °C contain a primary phase of ZnO with a hexagonal wurtzite structure and several secondary phases that impact the MOV performance. The MO additives, such as Bi2O3, In2O3, Sb2O3, transition element oxides, and rare earth oxides, act as ZnO grain growth inhibitors and enhance the density, microstructure homogeneity, and nonlinearity. Refinement of the microstructure of MOVs and consolidation under appropriate PM conditions improve their electrical properties (JL ≤ 0.2 mA/cm2, α of 22–153) and stability. The review recommends further developing and investigating large-sized MOVs from the ZnO-V2O5 systems using these techniques.

show abstract

Improvement of properties of ZnO varistors by low-temperature two-step sintering method

Liu

et al. 2022

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Two stage sintering behaviour of Er2O3 doped high performance ZnO varistors

Cited by 14 publications

References 59 publications

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Synthesis and characterization of ZnO based varistor ceramics: effect of sintering temperatures

Effects of Dopants and Processing Parameters on the Properties of ZnO-V2O5-Based Varistors Prepared by Powder Metallurgy: A Review

Improvement of properties of ZnO varistors by low-temperature two-step sintering method

Contact Info

Product

Resources

About