作　　者： ; ; ; ;

机构地区： 北方民族大学材料科学与工程学院

出　　处： 《电子显微学报》 2009年第1期46-51,共6页

摘　　要： 研究了AlN-R2O3(稀土氧化物)液相烧结碳化硅陶瓷在HF、HCl、NaOH、KOH、K3Fe(CN)6等单独或混合液中的腐蚀行为。检测了试样腐蚀前后的失重,用扫描电镜观察了试样腐蚀前后的显微形貌。结果表明,室温或煮沸条件下试样在HF、HCl、NaOH、KOH强酸、强碱中主要表现为晶隙液相腐蚀,晶隙间的玻璃相被腐蚀掉后留下形似岛屿的SiC晶粒,晶粒紧密相接的晶界未受侵蚀。试样在酸中比在碱中的腐蚀程度重。室温下腐蚀进程缓慢,煮沸后腐蚀迅速;在K3Fe(CN)6液中基本不受腐蚀;而在K3Fe(CN)6与KOH的混合水溶液中主要以晶界腐蚀为主,该混合液能很好地将晶体边缘轮廓腐蚀出来。在强酸中试样失重先快后慢;在强碱中试样不失重或失重轻微。 The corrosion behavior of LPS （liquid phase sintered） silicon carbide with AlN-R2O3 （ Y2O3 ＋ La2O3 ） as sintering additives were investigated. The samples were tested by putting into HF, HC1, NaOH, KOH, K3Fe（CN）6, etc. or mixed solution of them. The weight loss of samples after corrosion are measured. The SEM photo of the experimental specimen before and after corrosion are compared. The result shows that under both room and boiling temperature, the corrosion of LPS-SiC in HF, or in HC1, in NaOH, in KOH, all shows mainly intercrystalline liquid phase corrosion. Because glass phase of intercrystalline were etched off, the SiC crystals left look like islands. Tight connected grain boundary did not be etched. The corrosion extent of samples in acid are heavier than those in alkali. The erosion in room temperature developed much slower than it did in boiling temperature. Corrosion did not appeare in K3 Fe（CN）6. But in the mixture aqueous solution of K3 Fe（ CN）6 and KOH, corrosion did happen in the intercrystalline, angularity and scratch. So it is good to show the profile of the crystals by this erosion method. The weight loss of the samples in strong acid solution slow down with the process going on. In the strong alkali solution, the samples seldom have weight loss.

关 键 词： 碳化硅陶瓷 强酸碱 腐蚀液 抗腐蚀性

领　　域： [化学工程] [化学工程] [金属学及工艺] [金属学及工艺]