The effect of different solid phases on the pyroplastic deformation of porcelain

Deng, Tengfei; Liu, Bin; Xu, Xin; Wu, Jianfeng

doi:10.2109/jcersj2.123.1004

Cited by 19 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The flexural strength reaches its maximum until 1185°C, while found to decrease at higher temperature. The reason could be due to the melting of low-temperature eutectic mixture in iron ore and tailings, as well as the feldspar at about 1100°C, diffuse through the porous matrix causing the pores to plug thereby increasing the bulk density [21]. At a temperature of 1200°C, all the components in addition to low-temperature eutectic mixture began to melt reducing the properties.…”

Section: Thermal Conductivity Of the Samplesmentioning

confidence: 99%

Preparation and properties of endothermic functional ceramics with iron tailings as raw materials

Meng

Peng

Srinivasakannan

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

The present work attempts to utilize iron tailings as the main raw materials for preparation of functional ceramics as a means of resource utilization. A new type of endothermic functional ceramics, which can be used in the field of solar energy, was prepared via semi-dry pressing followed by pressureless sintering. The results show that the functional ceramics made of 68 wt% iron tailings, 26 wt% iron ore, 3 wt% alumina, 1 wt% potash feldspar and 2 wt% kaolin, sintered at 1185°C exhibited the best overall performance. Visual observation reveals that there were no cracks on the surface of the samples even after 20 cycles of intense thermal shock. Other attributes could be summarized as follows: Infrared emissivity in mid-infrared region: 0.85; thermal conductivity at 500°C: 2.066 W/ (m·K); flexural strength: 119.03 MPa. XRD analysis indicates that the main crystalline phases in the samples are augite, magnetite and a small amount of hematite. An increase in the proportion of iron oxide contributed to lower melting temperature of the functional ceramics, deepen color, promote densification and increase infrared emissivity. In short, the introduction of iron tailings improves the thermal and physical properties to a certain extent.

show abstract

Section: Thermal Conductivity Of the Samplesmentioning

confidence: 99%

Preparation and properties of endothermic functional ceramics with iron tailings as raw materials

Meng

Peng

Srinivasakannan

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…However, the short column shaped phases agglomerate around pores and those phases were already identified as mullite phases. 19) Some quartz phases exist in the glassy phase. Figure 7 shows the SEM image (both secondary electron and back scattered electron images) and element mappings in the area of the sample R3 fracture.…”

Section: Phase Composition and Microstructure Of The Samplesmentioning

confidence: 99%

“…Fly ash powders contain mullite crystal nuclei and some of the mullite nuclei locate on the surface of those floaters. 19) With the temperature rising, the nuclei start to grow and form as long strips. At around 1000°C, the liquid phase starts to generate.…”

Section: Densification Mechanismmentioning

confidence: 99%

“…The liquid phase envelopes the solid particles as well as the floaters. It should be mentioned that the chemical compositions of fly ash powders are mostly Al 2 O 3 and SiO 2 , 19) on the other hand, the ternary system Al 2 O 3 SiO 2 Na 2 O is easy to form as eutectics according to the phase diagram. 21) Thus, with the temperature arising, the wall of the floater melts and the shape of the floater remains.…”

Section: Densification Mechanismmentioning

confidence: 99%

See 1 more Smart Citation

Utilization of fly ash and red mud for thermal storage ceramics

Yan

Cheng

et al. 2019

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

The solid wastes Red mud and fly ash were used as the raw materials in the production of thermal storage ceramics. Red mud was used to lower the firing temperature and fly ash powders were introduced to improve the mechanical properties. The physical properties of samples, including firing behavior, thermal storage properties and thermal shock resistance were evaluated. Also, the effects of fly ash and red mud on the properties of ceramics were investigated. The results showed that the thermal shock resistance of the sample improved by the addition of fly ash powders in the preparation of thermal storage ceramics. Besides, the addition of red mud promoted the formation of liquid phase. In particularly, sample R3 (40 wt % fly ash, 15 wt % clay shale, 20 wt % feldspar, 25 wt % quartz and addition of 15 wt % red mud) fired at 1140°C exhibited the best performance, in which the open porosity, bulk density, bending strength, thermal conductivity at 500°C and theoretical heat storage density (room temperature-500°C) were 0.37%, 2.54 g/cm 3 , 89.81 MPa, 3.62 W/(m·K), 1.56 KJ/cm 3 , respectively. Despite the bending strength of R3 sample fired at 1140°C decreased by 20.29% after 30 thermal shock cycles, it still maintained a flexural strength of 73.78 MPa.

show abstract

“…10) Deng et al reported the effect of the distribution of mullite in the glass matrix on pyroplastic deformation. 11) Other studies revealed that the dissolution of quartz in the melt resulted in increasing the viscosity of the liquid phase, thus, reducing the pyroplastic deformation. 12)14) These studies mainly focused on the viscosity of the liquid phase or mullite phase formation in the glass matrix.…”

mentioning

confidence: 99%

Effect of talc addition on pyroplastic deformation of an alumina strengthened porcelain

Kamochi¹,

Nishiyama²,

Katsuki³

2016

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

The influence of talc addition on the pyroplastic deformation of alumina-strengthened porcelain was investigated in this study. Along with the lower content of feldspar, the addition of talc contributed to the crystallization of the cordierite during the firing process, and the resulting cordierite crystals formed complicated filler structures. The porcelain samples made with the addition of talc showed an unprecedented pyroplastic deformation characteristic with almost no changes in the pyroplastic deformation index value during further firing at over 100°C after the water absorption reached almost zero. This improvement of pyroplastic deformation was thought to synchronize with the crystallization of cordierite.©2016 The Ceramic Society of Japan. All rights reserved.Key-words : Pyroplastic deformation, Talc, Cordierite, Porcelain, Filler [Received June 1, 2016; Accepted June 30, 2016] In the long history of porcelain manufacturing, controlling the deformation of a porcelain body during its firing process is one of the most important problems due to its tendency to decrease the precise shape reproducibility of the final product after the firing process. During the firing process, shrinkage deformation and pyroplastic deformation are two main factors responsible for the distortion of the final products. Shrinkage deformation occurs in the first stage of firing before the full dense temperature, and pyroplastic deformation is dominant during the final stage of firing.1) Pyroplastic deformation affects the optimum firing temperature range, and is related to many factors such as chemical composition, particle size of raw materials, and firing pattern.The chemical reactions, phase development, and microstructural evolution of a porcelain body during the firing process have been studied extensively with some researches focused on pyroplastic deformation.2)9) Tuncel et al. have studied the effect of chemical composition on pyroplastic deformation at 1250°C, and demonstrated that the Na 2 /K 2 O ratio had a more prominent effect on pyroplastic deformation compared to changes in the SiO 2 /Al 2 O 3 ratio. 10) Deng et al. reported the effect of the distribution of mullite in the glass matrix on pyroplastic deformation.11) Other studies revealed that the dissolution of quartz in the melt resulted in increasing the viscosity of the liquid phase, thus, reducing the pyroplastic deformation. 12)14) These studies mainly focused on the viscosity of the liquid phase or mullite phase formation in the glass matrix. However, there are only few reported studies on the role of filler in the pyroplastic deformation of porcelain. Austin et al. have reported that the addition of alumina, with higher refractoriness than quartz, in vitreous whiteware was effective in decreasing deformation during firing, 15) which suggests the characteristic of filler is a sensitive factor on pyroplastic deformation of a porcelain body. On the other hand, Kobayashi studied the crystallization and densification of cordierite ceramics, and reported a hig...

show abstract

The effect of different solid phases on the pyroplastic deformation of porcelain

Cited by 19 publications

References 29 publications

Preparation and properties of endothermic functional ceramics with iron tailings as raw materials

Preparation and properties of endothermic functional ceramics with iron tailings as raw materials

Utilization of fly ash and red mud for thermal storage ceramics

Effect of talc addition on pyroplastic deformation of an alumina strengthened porcelain

Contact Info

Product

Resources

About