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浸渗处理及真空度对喷射粘结成形氧化钙基陶瓷型芯性能影响
Influence of Infiltration Treatment and Vacuum Degree on the Performance of Binder Jetting Molded Calcium Oxide-Based Ceramic Cores
【摘要】 采用喷射粘结成形技术,以重质碳酸钙作为原料,浸渗纳米ZrO2分散液后烧结得到了氧化钙基陶瓷型芯,研究了浸渗处理以及浸渗真空度对陶瓷型芯性能的影响。研究发现,浸渗处理后的陶瓷型芯内部生成了大量CaZrO3,使内部孔隙减少,微观组织更加致密,弯曲强度最大增加幅度为277.87%。浸渗处理时增大真空度可以进一步改善陶瓷型芯的性能,当真空度从0增加至0.05 MPa时,弯曲强度由7.15 MPa提升到8.88 MPa,但当真空度进一步增加至0.08 MPa时,弯曲强度却降至6.85 MPa,陶瓷型芯性能降低。不同处理工艺烧结后得到的陶瓷型芯浸泡在热水中5 min后即开始溃散,表现出良好的可溶性。
【Abstract】 Calcium oxide-based ceramic cores were sintered with heavy calcium carbonate as raw material by using binder jetting and infiltrated with nano-ZrO2 dispersion,and the effects of infiltration treatment and vacuum degree on the properties of ceramic cores were investigated.It was found that a large amount of CaZrO3 was generated inside the ceramic core after the infiltration treatment,which led to the reduction of the internal pores,the denser microstructure,and the maximum increase of flexural strength was 277.87%.The performance of the ceramic core can be further improved by increasing the vacuum degree during the infiltration treatment.When the vacuum degree increases from 0 to 0.05 MPa,the flexural strength increases from 7.15 MPa to 8.88 MPa.However,when the vacuum degree further increases to 0.08 MPa,the flexural strength decreases to 6.85 MPa,resulting in a deterioration of the ceramic core performance.The ceramic cores obtained after sintering with different treatment processes started to collapse after being immersed in hot water for 5 min,showing good solubility.
【Key words】 binder jetting; infiltration treatment; vacuum degree; heavy calcium carbonate; soluble ceramic core;
- 【文献出处】 铸造 ,Foundry , 编辑部邮箱 ,2024年01期
- 【分类号】TG221
- 【下载频次】24