CN107805071A - 一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法 - Google Patents
一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法 Download PDFInfo
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Abstract
本发明公开了一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,包括以下步骤:(1)将Ti3AlC2粉和莫来石粉混合均匀,形成的混合物中莫来石体积分数为1~90%;(2)将步骤(1)中的混合物经模具冷压成胚体;(3)将步骤(2)得到胚体置于流动氩气环境中,在800~1600℃条件下反应0.5~5小时,冷却后既得所需Ti3AlC2/莫来石复合陶瓷;本发明制备工艺简单、生产成本低、易于工业化推广。
Description
技术领域
本发明涉及一种复合陶瓷的制备方法,具体涉及一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法。
背景技术
Ti3AlC2/莫来石复合陶瓷是一种新型耐热复合陶瓷材料,兼具Ti3AlC2陶瓷和莫来石的热稳定性和耐热震性能;可以在高温下重复使用,达到工业化生产玻璃制品作为托板的要求;某玻璃厂目前生产玻璃制品使用的陶瓷托板为氧化铝-莫来石陶瓷复合材料,全部从日本进口,价格昂贵,且使用寿命低,易于开裂;Ti3AlC2是一种三元层状陶瓷,具有很好地导热性能、导电性能和力学性能,同时具有高的熔点、高的热稳定性和热震性能,常应用在高温领域;莫来石耐火度高、导热率很低,是理想的高级耐火材料;本发明制备的低玻璃润湿性Ti3AlC2/莫来石复合陶瓷满足工业化生产玻璃制品的要求。
发明内容
本发明提供一种导热率低、耐热性好和耐热震性能好的低玻璃润湿性的钛三铝碳二/莫来石复合陶瓷的制备方法。
本发明采用的技术方案是:一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将Ti3AlC2粉和莫来石粉混合均匀,形成的混合物中莫来石体积分数为1~90%;
(2)将步骤(1)中的混合物经模具冷压成胚体;
(3)将步骤(2)得到胚体置于流动氩气环境中,在800~1600℃条件下反应0.5~5小时,冷却后既得所需Ti3AlC2/莫来石复合陶瓷。
进一步的,得到Ti3AlC2/莫来石复合陶瓷后,将其进行高温热暴露氧化处理,处理温度在500~1500℃。
进一步的,所述步骤(1)中Ti3AlC2粉的粒径为200~400目,莫来石粉的粒径为200~400目。
进一步的,所述混合通过在滚筒式混料机上进行混合,混料5~20小时。
进一步的,所述步骤(2)中压力为3~12吨。
进一步的,所述步骤(3)升温速率为1~10℃/min,降温速率为1~10℃/min,氩气流量为50~250ml/min。
进一步的,所述高温热暴露氧化过程中升温速率为1~10℃/min,降温速率为1~10℃/min。
进一步的,所述高温热暴露氧化处理之前将Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光处理。
进一步的,所述高温热暴露氧化处理时间为4~24小时。
本发明的有益效果是:
(1)本发明通过混合烧结,即可获得Ti3AlC2/莫来石复合陶瓷,制备工艺简单、成本低,易于工业化推广;
(2)本发明获得的Ti3AlC2/莫来石复合陶瓷,烧结性好,在较低温度下即可烧结成形,远低于氧化铝-莫来石陶瓷高温烧结所需的1900℃,且力学性能优于氧化铝-莫来石陶瓷,抗热震性更好,使用寿命更长;
(3)本发明获得的Ti3AlC2/莫来石复合陶瓷在高温热暴露处理后,表面可获得一层厚厚的TiO2和Al2O3致密氧化膜,能增强Ti3AlC2/莫来石复合陶瓷的高温抗氧化性能和热稳定性能,同时可有效防止玻璃与Ti3AlC2/莫来石复合陶瓷发生粘结。
附图说明
图1为本发明实施例中制备的Ti3AlC2/莫来石复合陶瓷的X射线衍射图谱。
图2为本发明实施例中制备的Ti3AlC2/莫来石复合陶瓷的致密度曲线。
图3为本发明实施例中制备的Ti3AlC2/莫来石复合陶瓷的热导率曲线。
图4为本发明实施例1制备的Ti3AlC2/莫来石复合陶瓷的扫描电镜图。
图5为本发明实施例2制备的Ti3AlC2/莫来石复合陶瓷的扫描电镜图。
图6为本发明实施例3制备的Ti3AlC2/莫来石复合陶瓷的扫描电镜图。
图7为本发明实施例4制备的Ti3AlC2/莫来石复合陶瓷的扫描电镜图。
图8为本发明实施例5制备的Ti3AlC2/莫来石复合陶瓷的扫描电镜图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步说明。
实施例1
一种低玻璃润湿性Ti3AlC2/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将200~400目的Ti3AlC2粉和200~400目的莫来石粉进行混合,混合粉中莫来石的体积分数为10%,在滚筒式混料机上混料5个小时;
(2)将步骤(1)得到的混合粉末经模具冷压成坯体;
(3)将步骤(2)得到的胚体置于流动氩气的管式炉中,在1300℃条件下保温处理1小时,得到反应产物;管式炉的升温速率为5℃/min,降温速率为5℃/min,氩气流量为200ml/min;
(4)将步骤(3)得到的Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光;
(5)将步骤(4)中粗磨、细磨和抛光后的Ti3AlC2/莫来石复合陶瓷置于箱式电阻炉中进行高温热暴露氧化处理,处理温度在500℃,时间为24h。
得到的Ti3AlC2/莫来石复合陶瓷表面喷涂BN涂层后,即可用作生产玻璃制品的托板。
实施例2
一种低玻璃润湿性Ti3AlC2/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将200~400目的Ti3AlC2粉和200~400目的莫来石粉进行混合,混合粉中莫来石的体积分数为20%,在滚筒式混料机上混料10个小时;
(2)将步骤(1)得到的混合粉末经模具冷压成坯体;
(3)将步骤(2)得到的胚体置于流动氩气的管式炉中,在1500℃条件下保温处理2小时,得到反应产物;管式炉的升温速率为5℃/min,降温速率为5℃/min,氩气流量为200ml/min;
(4)将步骤(3)得到的Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光;
(5)将步骤(4)中粗磨、细磨和抛光后的Ti3AlC2/莫来石复合陶瓷置于箱式电阻炉中进行高温热暴露氧化处理,处理温度在800℃,时间为20h。
得到的Ti3AlC2/莫来石复合陶瓷表面喷涂BN涂层后,即可用作生产玻璃制品的托板。
实施例3
一种低玻璃润湿性Ti3AlC2/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将200~400目的Ti3AlC2粉和200~400目的莫来石粉进行混合,混合粉中莫来石的体积分数为30%,在滚筒式混料机上混料15个小时;
(2)将步骤(1)得到的混合粉末经模具冷压成坯体;
(3)将步骤(2)得到的胚体置于流动氩气的管式炉中,在1500℃条件下保温处理4小时,得到反应产物;管式炉的升温速率为5℃/min,降温速率为5℃/min,氩气流量为200ml/min;
(4)将步骤(3)得到的Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光;
(5)将步骤(4)中粗磨、细磨和抛光后的Ti3AlC2/莫来石复合陶瓷置于箱式电阻炉中进行高温热暴露氧化处理,处理温度1000℃,时间为16h。
得到的Ti3AlC2/莫来石复合陶瓷表面喷涂BN涂层后,即可用作生产玻璃制品的托板。
实施例4
一种低玻璃润湿性Ti3AlC2/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将200~400目的Ti3AlC2粉和200~400目的莫来石粉进行混合,混合粉中莫来石的体积分数为40%,在滚筒式混料机上混料15个小时;
(2)将步骤(1)得到的混合粉末经模具冷压成坯体;
(3)将步骤(2)得到的胚体置于流动氩气的管式炉中,在1400℃条件下保温处理2小时,得到反应产物;管式炉的升温速率为5℃/min,降温速率为5℃/min,氩气流量为200ml/min;
(4)将步骤(3)得到的Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光;
(5)将步骤(4)中粗磨、细磨和抛光后的Ti3AlC2/莫来石复合陶瓷置于箱式电阻炉中进行高温热暴露氧化处理,处理温度在1200℃,时间为10h。
得到的Ti3AlC2/莫来石复合陶瓷表面喷涂BN涂层后,即可用作生产玻璃制品的托板。
实施例5
一种低玻璃润湿性Ti3AlC2/莫来石复合陶瓷的制备方法,包括以下步骤:
(1)将200~400目的Ti3AlC2粉和200~400目的莫来石粉进行混合,混合粉中莫来石的体积分数为50%,在滚筒式混料机上混料20个小时;
(2)将步骤(1)得到的混合粉末经模具冷压成坯体;
(3)将步骤(2)得到的胚体置于流动氩气的管式炉中,在1600℃条件下保温处理1小时,得到反应产物;管式炉的升温速率为5℃/min,降温速率为5℃/min,氩气流量为200ml/min;
(4)将步骤(3)得到的Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光;
(5)将步骤(4)中粗磨、细磨和抛光后的Ti3AlC2/莫来石复合陶瓷置于箱式电阻炉中进行高温热暴露氧化处理,处理温度在1500℃,时间为4h。
得到的Ti3AlC2/莫来石复合陶瓷表面喷涂BN涂层后,即可用作生产玻璃制品的托板。
将本发明实施例1-5制备的产品进行X射线衍射测试,测试结果如图1所示,从图1中可以看出实施例1、实施例2、实施例3和实施例4得到的产品为Ti3AlC2/莫来石复合陶瓷,实施例5中得到的产品Ti3AlC2与莫来石发生了反应;将本发明实施例1-5制备的产品进行致密性测试,测试结果如图2所示,实施例1-5制备得到的产品致密度均大于65.92%,最高可达88.83%;将本发明实施例1-5得到的产品进行导热性测试,测试结果如图3所示,从图3中可以看出,实施例1-5制备得到的产品导热率均大于16.43W/(m·K),最高可达21.90W/(m·K);如4-8为本发明实施例1-5所制备产品的扫描电镜图;如图4-8所示,随着莫来石体积分数增大,Ti3AlC2/莫来石复合陶瓷的导热率将会越高,耐热性增强;但是复合陶瓷内部孔洞明显增多,致密度明显下降,力学性能也降低,抗热震性也会有所下降,使用寿命缩短。
在作为生产玻璃制品托板之前,通常先对其表面进行粗磨、细磨和抛光,再进行高温热暴露氧化处理,使其表面生成一层厚厚的TiO2和Al2O3致密氧化膜,从而具有低的玻璃润湿性,同时抗氧化性能和热稳定性能也得到加强;将实施例中制备的复合陶瓷用于生产玻璃制品试验,从实施例1-5所得产品的结果进行分析,实施例1中制备的产品将玻璃和Ti3AlC2/莫来石复合陶瓷分开比较困难,将会损坏玻璃制品;实施例2中将玻璃和Ti3AlC2/莫来石复合陶瓷分开比较容易;实施例3中将玻璃和Ti3AlC2/莫来石复合陶瓷分开也比较容易;实施例4中将玻璃和Ti3AlC2/莫来石复合陶瓷分开比较容易,但是可以看到Ti3AlC2/莫来石复合陶瓷上粘结有少量玻璃;实施例5中将玻璃和Ti3AlC2/莫来石复合瓷分开很困难,可以看到Ti3AlC2/莫来石复合陶瓷上粘结有大块玻璃,将会损坏玻璃制品。
从上述试验结果来看实施例2和实施例3中制备的Ti3AlC2/莫来石复合陶瓷可以完全替代从日本进口的氧化铝-莫来石陶瓷托板,不仅能延长陶瓷托板的使用寿命,而且可以降低生产成本,可以在玻璃厂广泛应用。
本发明Ti3AlC2/莫来石复合陶瓷是一种新型耐热复合陶瓷材料,兼具Ti3AlC2和莫来石的优点,具有很好的制备烧结性能,较高的耐热性和耐热震性,以及较低的导热率,适合作为陶瓷托板应用于生产玻璃制品,可以在高温下重复使用,达到工业化生产玻璃制品的要求。
文中钛三铝碳二/莫来石复合陶瓷即表示Ti3AlC2/莫来石复合陶瓷。
Claims (9)
1.一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,包括以下步骤:
(1)将Ti3AlC2粉和莫来石粉混合均匀,形成的混合物中莫来石体积分数为1~90%;
(2)将步骤(1)中的混合物经模具冷压成胚体;
(3)将步骤(2)得到胚体置于流动氩气环境中,在800~1600℃条件下反应0.5~5小时,冷却后既得所需Ti3AlC2/莫来石复合陶瓷。
2.根据权利要求1所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,得到Ti3AlC2/莫来石复合陶瓷后,将其进行高温热暴露氧化处理,处理温度在500~1500℃。
3.根据权利要求1所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述步骤(1)中Ti3AlC2粉的粒径为200~400目,莫来石粉的粒径为200~400目。
4.根据权利要求1所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述混合通过在滚筒式混料机上进行混合,混料5~20小时。
5.根据权利要求1所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述步骤(2)中压力为3~12吨。
6.根据权利要求1所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述步骤(3)升温速率为1~10℃/min,降温速率为1~10℃/min,氩气流量为50~250ml/min。
7.根据权利要求2所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述高温热暴露氧化过程中升温速率为1~10℃/min,降温速率为1~10℃/min。
8.根据权利要求2所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述高温热暴露氧化处理之前将Ti3AlC2/莫来石复合陶瓷表面进行粗磨、细磨和抛光处理。
9.根据权利要求2所述的一种低玻璃润湿性钛三铝碳二/莫来石复合陶瓷的制备方法,其特征在于,所述高温热暴露氧化处理时间为4~24小时。
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