CN112279636A - 一种瓷化致密蜂窝陶瓷蓄热体的制备方法 - Google Patents
一种瓷化致密蜂窝陶瓷蓄热体的制备方法 Download PDFInfo
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- 238000005338 heat storage Methods 0.000 description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
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- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种瓷化致密蜂窝陶瓷蓄热体的制备方法,所述瓷化致密蜂窝陶瓷蓄热体包括瘠性料和粘土类可塑性料,并包括下述方法步骤:a、先将收缩率大的无机矿物原料煅烧至烧结状态,然后破碎,所述石英、锂瓷石、锂长石直接破碎至一定粒径,同时用表面活性剂对粘土类可塑性料进行改性,再加入粘结剂和去离子水混合均匀,练泥,陈腐制成泥段;b、将陈腐的泥段挤制成型为坯体;c、将坯体进行干燥d、将干燥好的坯体检测切割烧制,获得瓷化致密蜂窝陶瓷蓄热体。本发明降低坯体收缩率,减少开裂;增加耐高温性能;降低烧结温度,增加坯体致密度及降低吸水率、显气孔率,达到致密化;便于挤出成型,易于烧制,提高良品率,降低成本。
Description
技术领域
本发明涉及蜂窝陶瓷蓄热体相关领域,特别涉及一种瓷化致密蜂窝陶瓷蓄热体的制备方法。
背景技术
蜂窝陶瓷蓄热体目前广泛用于工业热工设备节能技术方面,使工业热工设备提高效率,降低能耗,提高产量和改善质量,是解决能源与环境问题的重要而有效的手段。蜂窝陶瓷蓄热体孔道是相互平行的直通道结构,这种结构大大降低了气孔流经的阻力,大幅度提高了蓄热体的单孔体积换热效率。蜂窝陶瓷蓄热体产品功能:1.降低废气热损失,最大限度提高燃料的利用率,降低单位能耗;2.提高理论燃烧温度,改善燃烧条件,满足热工设备的高温要求,扩大低热值燃料的应用范围,尤其是高炉煤气的应用范围,提高燃料热值的利用率;3.改善炉膛热交换条件,提高设备的产量和产品的质量,减少设备投资;4.降低热工设备单位产品的废气排放量及有害气体的排放量,减少大气污染,改善环境。目前,市场上的蜂窝陶瓷蓄热体绝大多数吸水率都比较高,蓄热量小,致密性低,吸附能力强,在使用过程中,含酸碱性成分废气会对蓄热体产生腐蚀,导致蓄热体粉化,坍塌;而有些废气中含钛、硅等无机前驱体,经高温氧化成纳米钛、纳米硅等超细颗粒,会粘附并堵塞蓄热体孔道,降低蓄热体蓄热换热能力,最终导致系统崩溃。
如何解决上述问题,采用致密蓄热材料即可解决,但致密蓄热体生产极其困难,主要原因是收缩过大,干燥烧成时极易开裂,现市场上也没有相应的产品,要制备接近零吸水率,导热快,导热率大,蓄热能力强,可以耐腐蚀,耐渣的致密高铝莫来石质蓄热体是市场急需的产品。
发明内容
本发明针对上述现有蜂窝陶瓷蓄热体制备中存在的不足,提供一种致密高铝莫来石蓄热量大,抗渣、抗腐蚀,抗纳米硅粘附能力强,且导热率大,吸热放热快,换热效率高的瓷化致密蜂窝陶瓷蓄热体的制备方法。
本发明解决上述技术问题的技术方案:一种瓷化致密蜂窝陶瓷蓄热体的制备方法,所述瓷化致密蜂窝陶瓷蓄热体包括粒径相对较大的瘠性料和粒径相对较小的粘土类可塑性料,所述瘠性料包括氧化铝、铝矾土、滑石、石英、锂瓷石、锂长石,所述粘土类料包括高岭土、球土、瓷土,并包括下述方法步骤:
a、先将收缩率大的无机矿物原料煅烧至烧结状态,然后破碎成一定粒径料,所述石英、锂瓷石、锂长石直接破碎至一定粒径,同时用表面活性剂对粘土类料进行改性,再加入占原料总重量的1~5%的粘结剂和10~30%的去离子水混合均匀,倒入真空练泥机中进行练泥,经陈腐1~2天制成泥段;
b、将陈腐的泥段用挤出成型机挤制成型为坯体;
c、将坯体进行干燥1~24h,干燥温度为30~70℃;
d、将干燥好的坯体检测切割,使端面平整光滑,在1200℃~1500℃下烧制,获得瓷化致密蜂窝陶瓷蓄热体。
步骤a中所述收缩率大的无机矿物原料包括氧化铝、铝矾土、滑石、高岭土、球土、瓷土,煅烧温度为900~1400℃。
进一步地,步骤a中破碎成一定粒径为5~20um,粘土类料粒径为瘠性料粒径40%以下。
进一步地,步骤a中所述表面改性剂为硬脂酸或其盐、聚醚类、硅烷偶联剂中的至少一种。
进一步地,所述瓷化致密蜂窝陶瓷蓄热体的化学成分为:SiO2:10~90%、Al2O3:10~90%、Fe2O3:0.1~5%、TiO2:0.1~5%、CaO:0.1~5%、MgO:0.1~15%、K2O:0.1~3%、Na2O:0.~3%、其他:0.1~3%。
本发明的有益效果:(1)、先将氧化铝、铝矾土、高岭土、滑石等无机矿物原料煅烧至烧结状态,充分排除生料中含有的化学水、有机质及碳酸盐、硫酸盐等物质,然后破碎成一定粒径备用,此状态的原料基本不会再次收缩,会大幅降低坯体的收缩率,减少开裂情况;
(2)、然后按一定硅铝比调控配方,在高温烧成时生成二次莫来石相产生膨胀,进一步减小坯体体积收缩,同时莫来石相的增加也大幅提高蜂窝陶瓷蓄热体耐高温性能,延长使用寿命;
(3)、将瘠性原料研磨至一定粒径,高岭土等粘土类可塑性料粒径控制在瘠性料的40%以下,粒径大的瘠性料颗粒做类似等径体紧密堆积,小颗粒的粘土类料填充在大颗粒瘠性料堆积的孔隙中,一起形成近似紧密堆积结构,降低蜂窝陶瓷烧结温度,增加坯体致密度及降低吸水率、显气孔率,同时还能提高坯体容重,减小收缩率,达到致密化;
(4)、挤出成型过程中,粘土类料粘度高或流动性弱会导致泥料粘附在模具上,出现坯体表面粗糙、内应力大等问题,使产品易开裂,造成良品率低,本发明将粘土类料表面进行改性,可增强泥料流动性便于挤出成型,还能减少内应力产生,使产品易于烧制,提高良品率,降低制备成本。
具体实施方式
为了使本领域技术人员更好地理解本发明的技术方案,下面结合具体实施例来进一步详细描述本发明。
所述一种瓷化致密蜂窝陶瓷蓄热体的制备方法,所述瓷化致密蜂窝陶瓷蓄热体的化学成分为:SiO2:10~90%、Al2O3:10~90%、Fe2O3:0.1~5%、TiO2:0.1~5%、CaO:0.1~5%、MgO:0.1~15%、K2O:0.1~3%、Na2O:0. ~3%、其他:0.1~3%;;所述瓷化致密蜂窝陶瓷蓄热体包括粒径相对较大的瘠性料(在配方中占比80%以上)和粒径相对较小的粘土类可塑性料,粒径大的瘠性料颗粒做类似等径体紧密堆积,粒径小的粘土料颗粒填充在瘠性料颗粒堆积产生的空隙中,一起构成近似最紧密堆积结构,所述瘠性料包括氧化铝、铝矾土、滑石、石英、锂瓷石、锂长石,所述粘土类料包括高岭土(含球土、瓷土),它包括下述方法步骤:
a、先将收缩率大的无机矿物原料煅烧至烧结状态(煅烧温度为900~1400℃),然后破碎成一定粒径料,所述石英、锂瓷石、锂长石直接破碎至一定粒径,经破碎后,瘠性料粒径为5~20um,粘土类可塑性料粒径为瘠性料粒径40%以下,同时用表面活性剂对粘土类可塑性料进行改性(所述表面改性剂为硬脂酸或其盐、聚醚类、硅烷偶联剂等其中至少一种),再加入占原料总重量的1~5%的粘结剂和10~30%的去离子水混合均匀,倒入真空练泥机中进行练泥,经陈腐1~2天制成泥段;
b、将陈腐的泥段用挤出成型机挤制成型为坯体;
c、将坯体进行干燥1~24h,干燥温度为30~70℃;
d、将干燥好的坯体检测切割,使端面平整光滑,在1200℃~1500℃下烧制,获得瓷化致密蜂窝陶瓷蓄热体。
所述瓷化致密蜂窝陶瓷蓄热体的参数:吸水率为0~5%,显气孔率为0~10%,堆积密度为0.8~1.3之间,体积密度2.3~3.8g/cm3。
以上实施方式仅用以说明本发明的技术方案而非限制,尽管参照具体实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围,其均应涵盖在本发明的权利要求保护的范围中。
Claims (5)
1.一种瓷化致密蜂窝陶瓷蓄热体的制备方法,其特征在于:所述瓷化致密蜂窝陶瓷蓄热体包括粒径相对较大的瘠性料和粒径相对较小的粘土类可塑性料,所述瘠性料包括氧化铝、铝矾土、滑石、石英、锂瓷石、锂长石,所述粘土类料包括高岭土、球土、瓷土,并包括下述方法步骤:
a、先将收缩率大的无机矿物原料煅烧至烧结状态,然后破碎成一定粒径料,所述石英、锂瓷石、锂长石直接破碎至一定粒径,同时用表面活性剂对粘土类可塑性料进行改性,再加入占原料总重量的1~5%的粘结剂和10~30%的去离子水混合均匀,倒入真空练泥机中进行练泥,经陈腐1~2天制成泥段;
b、将陈腐的泥段用挤出成型机挤制成型为坯体;
c、将坯体进行干燥1~24h,干燥温度为30~70℃;
d、将干燥好的坯体检测切割,使端面平整光滑,在1200℃~1500℃下烧制,获得瓷化致密蜂窝陶瓷蓄热体。
2.根据权利要求1所述的一种瓷化致密蜂窝陶瓷蓄热体的制备方法,其特征在于:步骤a中所述收缩率大的无机矿物原料包括氧化铝、铝矾土、滑石、高岭土、球土、瓷土,煅烧温度为900~1400℃。
3.根据权利要求1所述的一种瓷化致密蜂窝陶瓷蓄热体的制备方法,其特征在于:步骤a中破碎成一定粒径为5~20um,粘土类料粒径为瘠性料粒径40%以下。
4.根据权利要求1所述的一种瓷化致密蜂窝陶瓷蓄热体的制备方法,其特征在于:步骤a中所述表面改性剂为硬脂酸或其盐、聚醚类、硅烷偶联剂中的至少一种。
5.根据权利要求1所述的一种瓷化致密蜂窝陶瓷蓄热体的制备方法,其特征在于:所述瓷化致密蜂窝陶瓷蓄热体的化学成分为:SiO2:10~90%、Al2O3:10~90%、Fe2O3:0.1~5%、TiO2:0.1~5%、CaO:0.1~5%、MgO:0.1~15%、K2O:0.1~3%、Na2O:0. ~3%、其他:0.1~3%。
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