粘土基微孔陶瓷渗灌灌水器制备与性能优化

Preparation and Performance Optimization of Clay-based Porous Ceramics Used in Subsurface Irrigation

提出了一种渗灌用粘土基微孔陶瓷的低成本制备工艺,通过对比不同制备工艺对粘土基微孔陶瓷的抗弯强度、线收缩率和开口孔隙率的影响规律,筛选出综合具有较高抗弯强度、较小线收缩率和较高开口孔隙率微孔陶瓷的最佳制备工艺。研究表明：烧结温度及炉渣的掺量和粒径对粘土基微孔陶瓷的物相成分、抗弯强度、线收缩率、开口孔隙率和微观结构有较大影响。其中,烧结温度为1 075℃,炉渣掺量质量分数为10%～30%的粗颗粒粘土基微孔陶瓷具有9.0～11.0 MPa的抗弯强度、3.8%～4.7%的线收缩率和36.8%～44.8%的开口孔隙率,是制备渗灌灌水器的理想材料。

Subsurface irrigation has been realized by burying pots, pitchers and subsurface porous pipe, but the present preparation process of porous ceramics could not meet the performance requirements of subsurface irrigation emitters. A new preparation process of clay-based porous ceramics used for subsurface irrigation with minimal cost was explored. The effects of the preparation process （shirking temperature, contents and particle size of slag in the green body） on flexural strength, linear shrinkage and open porosity of porous ceramic were discussed. Finally, the optimal preparation process of porous ceramic with high flexural strength, low linear shrinkage and elevated open porosity were selected. The results showed that the sintering temperature and the contents and particle size of slag in ihe green body were three key factors influencing the properties of porous ceramics. When sintering temperature was 1 075~C along with content of slag in the green body between 10% and 30% , the porous ceramics showed the best performance with maximum particle size of 0. 613 mm. Flexural strength of porous ceramic was 9.0 - 11.0 MPa with open porosity of 36. 8% -44. 8% and the linear shrinkage was 3.8% 4.7%. Therefore, the clay-based porous ceramic could be the appropriate material for subsurface irrigation emitter.