Crystallization Products and Structural Characterization of CaO-SiO₂-Based Mold Fluxes with Varying Al₂O₃/SiO₂ Ratios.

Clicks: 371
ID: 62837
2019
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Steady

Ranked #60 of 812 articles by views in Materials (Basel, Switzerland)

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 812 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
During the casting of high aluminum steel, the dramatic increase in the Al₂O₃/SiO₂ ratio is inevitable, resulting in significant changes of the crystallization behavior, which would result in heat transfer and lubrication problems. Crystallization products and structure characterization of glassy CaO-SiO₂-based mold fluxes with different Al₂O₃/SiO₂ ratios were experimentally investigated using a differential scanning calorimetry technique and Raman spectroscopy. With increasing Al₂O₃/SiO₂ ratios, the following results were obtained. The crystallization temperature and the crystallization products are changed. With increasing Al₂O₃/SiO₂ ratios from 0.088 to 0.151, the crystallization temperature first increases greatly from 1152 °C to 1354 °C, and then moderately increases. The crystallization ability of the mold flux is strengthened. The species of the precipitated crystalline phase change from two kinds, i.e., Ca₄Si₂O₇F₂ and Ca₂SiO₄, to four kinds, i.e., Ca₄Si₂O₇F₂, Ca₂SiO₄, 2CaO·Al₂O₃·SiO₂ and CaAlOF₂, the crystallization ability of Ca₄Si₂O₇F₂ is gradually attenuated, but other species show the opposite trend. The results of Raman spectroscopy indicate that Al mainly acts as a network former by the information of [AlO₄]-tetrahedral structural units, which can connect with [SiO₄]-tetrahedral by the formation of new bridge oxygen of Al⁻O⁻Si linkage, but there is no formation of Al⁻O⁻Al linkage. The linkage of Al⁻O⁻Si increases and that of Si⁻O⁻Si decreases. The polymerization degree of the network and the average number of bridging oxygens decrease. Further, the relatively strong Si⁻O⁻Si linkage gradually decreases and the relatively weak Al⁻O⁻Si gradually increases. The change of the crystalline phase was interpreted from the phase diagram and structure.
Reference Key
gao2019crystallizationmaterials Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Gao, Yuxiang;Leng, Mei;Chen, Yangfan;Chen, Zhichao;Li, Jiangling;
Journal Materials (Basel, Switzerland)
Year 2019
DOI
E206
URL
Keywords
structure al2o3/sio2 ratio crystallization products mold flux

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.