Abstract:

Corundum-based porous ceramic samples were prepared using white fused corundum powder as the main raw material,water-based or oily bisphenol F epoxy resin as the binder,water or ethanol as the solvent,water-based or oily fatty amine as the curing agent,batching,stirring,light ramming,drying,and holding at 150 ℃ for 2 h.The effects of the bisphenol F epoxy resin types (water-based or oil-based),the particle size of the corundum powder (100,220,800 mesh,i.e.<0.15,<0.07,<0.02 mm),and the amount of resin (3,5,8,11 g) and whether to add coupling agent on the apparent porosity,the cold modulus of rupture (CMOR),MOR retention ratio after water immersion were studied.The results show that:(1)compared with the water-based bisphenol F epoxy resin bonded samples,the oil-based bisphenol F epoxy resin bonded samples have smaller apparent porosity and higher CMOR;(2)as the particle size of the corundum powder decreases,the apparent porosity of the samples gradually decreases,and the CMOR first increases and then decreases;the overall performance of the sample prepared with <0.07 mm (220 mesh) corundum powder is good with the apparent porosity of 46.26% and the CMOR of 13.21 MPa;(3)as the amount of bisphenol F epoxy resin increases,the apparent porosity of the samples gradually decreases,and the CMOR and the CMOR after immersion in water gradually increase;the prepared sample added with 5 g of oily bisphenol F epoxy resin has the best overall performance: the apparent porosity is 36.81%,the CMOR reaches 20.98 MPa,and the CMOR retention ratio after water immersion for 48 h is 27.98%;(4)after adding 1.2 g of silane coupling agent KH-560,the CMOR retention ratio after immersion is greatly increased to 80%.

Key words: corundum, porous ceramics, epoxy resin, strength retention ratio

摘要：

以电熔白刚玉粉为主要原料,水性双酚F环氧树脂或油性双酚F环氧树脂为结合剂,水或乙醇为溶剂,水性脂肪胺或油性脂肪胺为固化剂,经配料、搅拌、轻捣成型、干燥后,于150 ℃保温2 h制成刚玉基多孔陶瓷试样。研究了双酚F环氧树脂种类(分别为水性或油性)、刚玉粉粒度(分别为100、220、800目,即<0.15、<0.07、<0.02 mm)、树脂用量(分别为3、5、8、11 g)以及是否添加偶联剂对试样显气孔率、常温抗折强度、浸水后抗折强度保持率等性能的影响。结果表明:1)与水性双酚F环氧树脂结合试样相比,油性双酚F环氧树脂结合试样的显气孔率较小,常温抗折强度较大。2)随着刚玉粉粒度的减小,试样显气孔率逐渐减小,常温抗折强度呈先增大后减小的变化趋势;采用<0.07 mm(220目)刚玉粉制备的试样综合性能较好,显气孔率为46.26%,常温抗折强度为13.21 MPa。3)随着双酚F环氧树脂添加量的增加,试样的显气孔率逐渐减小,常温抗折强度和浸水后常温抗折强度逐渐增大;添加5 g油性双酚F环氧树脂制备的试样综合性能最优,显气孔率为36.81%,常温抗折强度达20.98 MPa,浸水48 h后常温抗折强度保持率为27.98%。4)添加1.2 g硅烷偶联剂KH-560后,试样浸水后常温抗折强度保持率大幅提高至80%。

关键词: 刚玉, 多孔陶瓷, 环氧树脂, 强度保持率