Effect of hollow insulation riser on shrinkage porosity and solidification structure of ingot

Liu, Yingjie; Peng, Chun-lin; Li, Wanming; Zhu, Xinqun; Shen, Minggang; Liao, Xiangwei; Liu, Kun; Wei, Chongyi; Yusuf, Yusuf Abba; Yang, Jing; Cai, Chang-you

doi:10.1007/s42243-022-00790-8

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…The bar chart for the k values of flexible aerogels was shown in Figure 7b and summarized in Table 2. First, the k value of FSA was 0.114 W/m • K. Upon the addition of 1 wt% of MTMS, the k value of FSA-M1 increased up to 0.120 W/m • K. This may be attributed to the lower specific surface area of FSA-M1 as compared to that of FSA, implying that a reduced amount of air (k of air = ~0.0257 W/m • K [32]) is trapped in FSA-M1, which leads to a higher k value. By increasing the loading of MTMS, the k value of FSA-M5 and FSA-M10 was further elevated to 0.131 and 0.135 W/m • K, respectively.…”

Section: Surface Morphologymentioning

confidence: 99%

“…The test was done with two test sample pieces cut of the same thickness and dimension, in this case, 10 mm in height and 16.8 mm in diameter, with an insulating cover at both ends to avoid heat loss. A controllable hot disk sensor is placed in between the two sample pieces, providing a heat source at the same time as taking a measurement of the k value, based on the Transient plane source method, TPS [32]. The bar chart for the k values of flexible aerogels was shown in Figure 7b and summarized in Table 2.…”

Section: Surface Morphologymentioning

confidence: 99%

“…Polymers 2023, 15, x 9 of 15 W/m°K. This may be attributed to the lower specific surface area of FSA-M1 as compared to that of FSA, implying that a reduced amount of air (k of air = ~0.0257 W/m°K [32]) is trapped in FSA-M1, which leads to a higher k value. By increasing the loading of MTMS, the k value of FSA-M5 and FSA-M10 was further elevated to 0.131 and 0.135 W/m°K, respectively.…”

Section: Surface Morphologymentioning

confidence: 99%

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Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

et al. 2023

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Research on the development of flexible silica aerogels (FSAs) has been ongoing due to their excellent thermal insulation, low density, and high elasticity. However, the physical properties of FSAs, such as density, thermal conductivity, mechanical strength, and surface wettability, are highly dependent on the preparation conditions. To achieve the desired properties of FSAs for various applications, it is necessary to develop a method to fine-tune their physical properties. In this paper, two modifiers of methyltrimethoxysilane (MTMS)/trimethylethoxysilane (TMES) were employed to fine-tune the bulk density of a series of flexible silica aerogels (FSAs), reflecting a series of FSAs with fine-tunable physical properties. First, the precursor was synthesized by a click reaction between vinyltrimethoxysilane (VTMS) and 2,2′ (ethylenedioxy) diethanethiol (EDDET). The VTMS, EDDET, and the as-prepared precursor were characterized by FT-IR and NMR spectroscopy. Subsequently, the precursor was converted into a series of FSAs (denoted by FSA, FSA-M, and FSA-T) through conventional sol-gel reactions with/without MTMS/TMES. Chemical structures of synthesized FSAs were confirmed by 13C and 29Si solid-state NMR spectroscopy. The porous structure of FSAs was identified by BET and SEM, respectively. Physical properties, such as thermal conductivity, mechanical strength, and surface wettability of FSAs were determined by a Hot Disk, durometer/DMA in compression mode, and contact angle measurements, respectively. This study found FSAs containing none, 1 wt%, 5 wt%, and 10 wt% of MTMS increase the density of FSAs from 0.419 g/cm3 (FSA), 0.423 g/cm3 (FSA-M1), 0.448 g/cm3 (FSA-M5), and 0.456 g/cm3 (FSA-M10). It should be noted that the thermal conductivity, surface hardness, bulk mechanical strength, and hydrophobicity of FSA-Ms of increasing MTMS loading were all found to show a rising trend, while FSA-Ts exhibited lower density. FSA-T10 exhibited lower thermal conductivity, surface hardness, and bulk mechanical strength as compared to FSA. However, it was found to show higher hydrophobicity as compared to that of FSA.

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Section: Surface Morphologymentioning

confidence: 99%

Section: Surface Morphologymentioning

confidence: 99%

Section: Surface Morphologymentioning

confidence: 99%

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Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

et al. 2023

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“…This problem will affect the quality of steel ingots, the subsequent forging process and the subsequent product flaw detection qualification rate and product quality. In serious cases, the product will be scrapped [6][7][8][9] . Therefore, it is necessary to systematically optimize the design of the integral ingot casting system to improve the quality of ingot casting.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of solidification modes of different steels

Xu,

Ge,

Guo

et al. 2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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Six tons of steel ingots that have three different temperature windows in the solid-liquid regions were simulated and studied via casting simulation software. The distributions of the porosity and crack in the steel ingots were simulated and predicted. The simulation results showed significant differences among the steel ingot solidification mode in different solid-liquid regions. The solidification mode converted from “U” type to “V” type as the change of temperature window range. The simulation results were strongly consistent with the experimental data. Based on these analysis, we optimized the casting procedure and verified its reliability by experiments. The porosity and crack were fully removed after optimization, which increased the quality of steel ingots and utilization ratio.

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“…The liquid enrich in solute flows under the action of gravity and natural convection, resulting in the formation of macrosegregation [1][2][3][4][5] of the ingot. In addition, large ingot also has inclusions [6][7][8][9], shrinkage porosity [10][11][12] and other defects. In the subsequent processing, macrosegregation and inclusions and other defects are difficult to eliminate, reducing the performance of the product, and even leading to its direct scrap [13,14].…”

Section: Introductionmentioning

confidence: 99%

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

Wang

Shuai

et al. 2023

Materials Science and Technology

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A novel method by adding inorganic heat absorption material (IHAM) into the molten steel was proposed to improve the quality of large steel ingots. The IHAM was found to melt and float up after absorbing the heat of molten steel, stirring the melt and thus accelerating the cooling process. The molten steel was also purified as the inclusions were adsorbed during the floating of IHAM. The addition of IHAM rod was conducive to increase the equiaxed grain ratio (EGR) and alleviate the central carbon segregation, while the IHAM cored wire played a more important role in reducing the inclusion index. This method holds broad appeal to solidification of large steel ingot, as it can improve the microstructure of solidified ingot.

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Effect of hollow insulation riser on shrinkage porosity and solidification structure of ingot

Cited by 9 publications

References 21 publications

Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

Simulation analysis of solidification modes of different steels

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

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