陶瓷学报
陶瓷學報
도자학보
Journal of Ceramics
2015年
5期
511-515
,共5页
冯翀龙%刘维良%李阳城%曾小军%徐兆良
馮翀龍%劉維良%李暘城%曾小軍%徐兆良
풍충룡%류유량%리양성%증소군%서조량
碳化硼%陶瓷膜%水基流延
碳化硼%陶瓷膜%水基流延
탄화붕%도자막%수기류연
B4C%ceramic film%aqueous tape-casting
以B4C粉为主要原料、Al2O3粉与Y2O3粉为烧结助剂、聚乙酰亚胺(PEI)为分散剂、聚乙二醇(PEG)为增塑剂、分别以聚乙烯醇(PVA)和明胶为粘结剂,采用水基流延法制备B4C陶瓷材料.研究了pH值、分散剂用量、粘结剂种类和用量对流延浆料流变性的影响以及烧结温度对B4C陶瓷材料显微结构与力学性能的影响.实验结果表明,在酸性条件下,1.0wt.%的PEI,5.0wt.%的PVA或7.0 wt.%明胶制得的浆料分散稳定,流变性好;PVA为粘结剂制备的流延膜柔韧性和强度较好,明胶为粘结剂制备的流延膜具有凝胶性.烧结温度为2000℃时,B4C陶瓷材料力学性能最佳,相对密度、抗弯强度、断裂韧性和维氏硬度分别达到98.4%、484.63 MPa、5.86 MPa·m1/2、38.2 GPa.
以B4C粉為主要原料、Al2O3粉與Y2O3粉為燒結助劑、聚乙酰亞胺(PEI)為分散劑、聚乙二醇(PEG)為增塑劑、分彆以聚乙烯醇(PVA)和明膠為粘結劑,採用水基流延法製備B4C陶瓷材料.研究瞭pH值、分散劑用量、粘結劑種類和用量對流延漿料流變性的影響以及燒結溫度對B4C陶瓷材料顯微結構與力學性能的影響.實驗結果錶明,在痠性條件下,1.0wt.%的PEI,5.0wt.%的PVA或7.0 wt.%明膠製得的漿料分散穩定,流變性好;PVA為粘結劑製備的流延膜柔韌性和彊度較好,明膠為粘結劑製備的流延膜具有凝膠性.燒結溫度為2000℃時,B4C陶瓷材料力學性能最佳,相對密度、抗彎彊度、斷裂韌性和維氏硬度分彆達到98.4%、484.63 MPa、5.86 MPa·m1/2、38.2 GPa.
이B4C분위주요원료、Al2O3분여Y2O3분위소결조제、취을선아알(PEI)위분산제、취을이순(PEG)위증소제、분별이취을희순(PVA)화명효위점결제,채용수기류연법제비B4C도자재료.연구료pH치、분산제용량、점결제충류화용량대류연장료류변성적영향이급소결온도대B4C도자재료현미결구여역학성능적영향.실험결과표명,재산성조건하,1.0wt.%적PEI,5.0wt.%적PVA혹7.0 wt.%명효제득적장료분산은정,류변성호;PVA위점결제제비적류연막유인성화강도교호,명효위점결제제비적류연막구유응효성.소결온도위2000℃시,B4C도자재료역학성능최가,상대밀도、항만강도、단렬인성화유씨경도분별체도98.4%、484.63 MPa、5.86 MPa·m1/2、38.2 GPa.
B4C ceramic film was prepared by aqueous tape-casting with boron carbide powder as starting material,Al2O3 and Y2O3as sintering aids,Polymine (PEI) as dispersant,polyethyleneglycol (PEG) as plasticizer,poval (PVA) and gelatin as binder respectively. The influences of pH,dispersant content,the kinds and content of binder on rheological property and the effect of the sintering temperature on the microstructure and mechanical properties of B4C ceramic composites were studied. The experimental results indicated that,in acid medium,the slurry with good stability and rheology could be prepared with 1.0 wt.% PEI,5.0 wt.% PVA or 7.0 wt.% gelatin. Cast film had better flexibility and strength with PVA as binder,and gel property with gelatin as binder. The results indicated that the best mechanical properties of B4C ceramic composites were achieved when the sintering temperature was 2000℃,the relative density,bending strength,fracture toughness and vickers hardness of the composites were 98.4%,513.19 MPa,6.58 MPa· m1/2,38.6 GPa,respectively.