Zero‐Waste Progress for the Synthesis of High‐Purity β‐Sialon Ceramics from Secondary Aluminum Dross,Advanced Engineering Materials

当前位置： X-MOL 学术 › Adv. Eng. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Zero‐Waste Progress for the Synthesis of High‐Purity β‐Sialon Ceramics from Secondary Aluminum Dross
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-09 , DOI: 10.1002/adem.202001298
Weijun Zhu ₁ , Kangkai Wu ₁ , Senjing Zhang ₁ , Jun Liu _{2,

3} , Xuemei Yi ₁ , Lihua Zhang ₄

Affiliation

β‐Sialon materials are synthesized by nitriding reduction reaction using secondary aluminum dross and Si powder as the raw materials. The results indicate that the phases of products are stratified, in which the lower layer is pure β‐Sialon and the upper layer is mainly β‐Sialon, Al₂O₃ and spinel. This is caused by the transformation of the Si powder from solid to liquid phase and the metal oxide floating to the upper layer under the action of gravity. The aspect ratio of elongated β‐Sialon grains rapidly increases as the Si/Al ratio increases, and β‐Sialon grains finally became fibrous. Rod‐like and fluffy whiskers are observed and their growth mechanisms are the double‐stage vapor–liquid–solid mechanism at the base and vapor–solid mechanism at the tip. In the upper layers, the whiskers mainly grow on the surface and the gap, and the reactions are solid–gas reaction and gas–gas reaction, respectively.

中文翻译：

利用二次铝渣合成高纯度β-赛隆陶瓷的零废物进展

β-Sialon材料是通过二次铝渣和Si粉为原料通过氮化还原反应合成的。结果表明，产物相呈分层状，下层为纯β-Sialon，上层以β-Sialon，Al ₂ O _3为主。和尖晶石。这是由于硅粉在重力作用下从固相转变为液相以及金属氧化物浮到上层所致。随着Si / Al比的增加，细长的β-Sialon晶粒的长径比迅速增加，并且β-Sialon晶粒最终变为纤维状。观察到棒状和蓬松的晶须，它们的生长机理是在底部的双阶段气液固机理和在尖端的气固机理。在上层，晶须主要生长在表面和间隙，反应分别为固-气反应和气-气反应。

更新日期：2021-01-09

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11