文章信息/Info

Title:

Effect of MnO2 on Properties of α-Alumina Ceramic Supports in Composite Sintering Auxiliaries

文章編號:

1674-3962(2020)02-0146-05

作者:

劉婷; 同幟; 王丹; 王佳悅

（西安工程大學環境與化學工程學院，陜西 西安 710048）

Author(s):

LIU Ting;  TONG Zhi;  WANG Dan;  WANG Jiayue

(School of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China)

關鍵詞:

二氧化錳; α-Al2O3陶瓷支撐體; 孔隙率; 抗折強度; 純水通量; 酸堿腐蝕率

Keywords:

MnO2;  α-Al2O3 ceramic supports;  porosity;  flexural strength;  pure water flux;  acid/alkali corrosion rate

分類號:

TQ051.8+93

DOI:

10.7502/j.issn.1674-3962.201808040

文獻標志碼:

A

摘要:

采用擠壓成型法和固態粒子燒結法制備α-Al2O3陶瓷支撐體，主要研究復相燒結助劑MgO-MnO2-TiO2中MnO2添加量(質量分數)對陶瓷支撐體性能的影響。通過壓汞法、內外加壓法、三點彎曲法、質量損失法、掃描電鏡和X射線衍射等方法對α-Al2O3陶瓷支撐體的孔隙率、純水通量、抗折強度、酸堿腐蝕、微觀結構及晶體類型和晶相成分進行分析表征。研究結果表明：MnO2能夠和Al2O3形成固溶體Mn2AlO4，使晶格畸化，增加晶體的結構缺陷，從而降低燒結溫度，促進α-Al2O3陶瓷支撐體的燒結。當MnO2添加量少于0.5%時，燒結不完全；MnO2添加量大于2%時，晶粒出現異常生長；MnO2的添加量為1.5%時，制備的α-Al2O3陶瓷支撐體樣品性能最佳，孔隙率為38.25%，抗折強度為80.3 MPa，純水通量達6579.52 L/(m2·h·MPa)，酸/堿腐蝕重量損失率為1.22%/0.90%。

Abstract:

The α-Al2O3 ceramic support was prepared by extrusion-forming and solid sintering methods. The effect of MnO2 addition on the performance of ceramic support was mainly studied. Mercury intrusion method, self-made pure water flux measurement device, three-point bending method, mass loss method, SEM and XRD were used to analyze the porosity, pure water flux, flexural strength, acid and alkali corrosion, surface morphology and crystal phases of the α-Al2O3 ceramic support. The results show that: MnO2 can form a solid solution Mn2AlO4 with alumina, which deforms the lattice and increases structural defects, thereby lowering the sintering temperature and promoting the sintering of the α-Al2O3 ceramic support. When the additive amount of MnO2 is less than 0.5%, the sintering is incomplete, and when the additive amount of MnO2 is more than 2%, the crystal grains grow differently. The optimum dosage of MnO2 is 1.5%, where the prepared support has a good performance with a porosity of 38.25%, the flexural strength is 80.3 MPa, the pure water flux is 6579��52 L/(m2·h·MPa), the weight loss rate of acid/alkali corrosion is only 1.22%/0.90%.