十六烷基硫酸钠制备Al_2O_3泡沫陶瓷及性能研究

Preparation and Properties of Alumina Ceramic Foams Prepared with Cetyl Sodium Sulfate

首次以长链表面活性剂十六烷基硫酸钠对氧化铝陶瓷粉体进行修饰,用固相含量(质量分数)为8%~40%的浆料经搅拌发泡制备了颗粒稳定泡沫,常温常压干燥后在1550℃下烧结2 h,得到容重76~355 kg/m^3(气孔率91.1%~98.1%)的轻质氧化铝泡沫陶瓷。研究了p H、十六烷基硫酸钠浓度及浆料固相含量对氧化铝泡沫浆料稳定性以及泡沫陶瓷性能的影响。通过加入质量分数0.2%~1.0%PVA制备稳定泡沫浆料同时有效地提高了干燥泡沫坯体的强度。

Long-chain surfactant cetyl sodium sulfate was used to modify alumina particles for the first time. Alumina particle-stabilized foams were prepared by mechanical agitation of suspensions with solid loading of 8 wt%~40 wt%. The wet foams were dried at normal temperature and pressure and subsequently sintered at 1550 °C for 2 h and finally light weight alumina ceramic foams with density of 76~355 kg/m^3(namely porosity of 91.1%~98.1%) were prepared. Effects of p H value, cetyl sodium sulfate concentration and solid loading on the stability of alumina wet foams and properties of alumina ceramic foams were studied. Results show that stable wet foams can be prepared and the strength of dried foams is improved effectively by adding 0.2 wt%~1.0 wt% PVA.