料浆发泡工艺对轻质日用陶瓷性能的影响

Effects of Slurry Foaming Technology on Performances of Lightweight Domestic Ceramics

通过料浆发泡和注浆成形技术制备出轻质化日用陶瓷制品,并研究了发泡剂添加量、减水剂种类、料浆pH值对料浆流动性、坯体成形和烧成性能的影响。结果表明:随着发泡剂添加量的增多,坯体脱模难度增大,且陶瓷生坯强度、烧成强度和体积密度均会有所下降。适当控制发泡剂的添加量,通过料浆微孔发泡技术可制备出符合要求的轻质日用陶瓷,其适宜的条件是水玻璃添加量为2%、料浆pH值为9、水料比为0.55。当外加发泡剂添加量为0.8‰时,所得试样的显气孔率可提高一倍以上、体积密度可下降25%以上,但其抗折强度仍可达28MPa以上。该技术将为日用陶瓷行业的节能减排提供一种有效的技术途径。

Lightweight domestic ceramics were successfully prepared by slurry foaming and slip casting technologies.Effects of the adding amount of foaming agent、different water reducing agents and the pH value of slurry on the slurry fluidity、forming performance of green body and properties of the ceramic samples were analyzed in this paper.It is shown that the mechanical properties of the green body and the ceramic samples as well as their bulk density decreased with increasing the amount of foaming agents,and the demoulding of green body also became more difficult.The lightweight domestic ceramics meeting the production requirements could be prepared using slurry foaming and slip casting technologies by appropriately controlling the adding amount of the foaming agent,and the suitable conditions were as follows：sodium silicate solution 2%,slurry pH of 9 and water/raw materials mass ratio of 0.55.It was found that the apparent porosity of the ceramic samples could be increased by more than twice,and the volume density could be decreased by more than 25%,but the flexural strength still exceeded 28 MPa when 0.8‰ foaming agent was mixed in the slurry.Such a technology is expected to provide an effective technical route for further developing lightweight ceramics and energy conservation technologies for domestic ceramics.