سه شنبه 13 دی 1390

فرایند خزش در لعاب و روش مقابله با آن 2

• نوشته شده توسط: حامد ملکی

۷۱) زمان سایش 
‏توزیع دانه بندی ریزتر به دلایلی که در ادامه خواهد آمد خزش را به شدت تشدید می نماید.

۲- Overgrinding

2-1) هیدراتاسیون فریت
‏سایش بالا موجب هیدراتاسیون بخشی از فریت گشته و آزاد شدن آب از این نمکهای هیدراته در خلال پخت موجب گسیختگی سطحی لعاب و در نهایت خزش می گردد.

۲-۲) شکستن باندها 
‏آزاد شدن بار عنفی نمک های حاصل از شکست باندها و اعمال آن بر صفحات رسی خواص سوسپانسیونی دوغاب و پلاستیسیته لایه نشست کرده لعاب را تغییر می دهد.

۲-۳‏) تشکیل مواد کلوئیدی بیشتر 
‏سایش بالا، کسر مواد دانه ریز، با سایز کلوئیدی را افزاش می دهد.

۲-۴) افزایشی اکتیویته شیمیائی 
‏واکنش بین مواد از طریق سطح صورت گرفته و این سطح در دسترس تابع توزیع دانه بندی است، توزیع دانه بندی ریزتر با افزایش عرصه مخصوص سطحی ذرات، اکتیویته شیمیائی آنها را افزایش می دهد. این اکتیویته شیمیائی بالا به واسطه فعل و انفعالات لایه بافر موجب افزایش کشش سطحی و تشدید خطر خزش می گردد.

۲-۵) Pulvirization ذرات
‏این رخداد به تولید لعاب های Dusty Glaze با توان چسبندگی کمتر می انجامد.

۲-۶) فشردگی پوشش نشست کرده لعاب 
‏لعاب های ریز آسیاب شده حاوی رس های پلاستیک به واسطه فشردگی لایه نشست کرده لعاب مانع خروج سهل رطوبت گشته و فشار حادث شده موجب پی زدن لعاب و خزش آن می گردد.

۲-۷) خواص Cement گونه اجزاء ریز آسیاب شده
خواص سیمان گونه اجزاء ریز آسیاب شده کشش سطحی و در نتیجه خط خزش را افزایش می دهد.

۳- شوره زنی و رسوب نمکهای محلول

۳-۱) اثر پیرولیز و تجزیه نمک های محلول
‏هر سه مرحله پیرولیز نمک های محلول با آزاد شدن کمیت متنا بهی بخار آب و گاز همراه است که پس زدن لعاب را به همراه دارد.

۳-۲‏) اثر فرآیند خشک کردن بر روی پروسه شوره ‏زنی 
Drying scum ‏یا کف مرحله خشک کردن باندهای اتصال لعاب و بدنه را در لایه بافر تضعیف می نماید.


نظرات() 



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