CN111533547B - 一种低铝高硅高强度不变形釉面砖及其制备方法 - Google Patents
一种低铝高硅高强度不变形釉面砖及其制备方法 Download PDFInfo
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- 238000000034 method Methods 0.000 abstract description 17
- 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 31
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种低铝高硅高强度不变形釉面砖,包括坯体和设于坯体上的釉面;其特征在于,所述坯体主要由以下重量百分比的原料制成:钠石粉8~12份、钾钠石粉35~42份、高温砂2~5份、中温砂10~15份、添加剂0.1~5份、黑坭3~8份、高岭土7~12份、水洗坭12~17份、滑石2~4份;上述原料重量份之和为100份;其中,所述坯体中,Al2O3含量为15~17wt%;所述添加剂中SiO2含量为73~76wt%,Al2O3含量为17~20wt%。相应的,本发明还公开了上述低铝高硅高强度不变形釉面砖的制备方法。实施本发明,可有效降低坯体中的氧化铝含量,同时提升釉面砖的强度,减少变形。
Description
技术领域
本发明涉及陶瓷砖技术领域,尤其涉及一种低铝高硅高强度不变形釉面砖及其制备方法。
背景技术
在瓷质釉面砖,如仿古砖、全抛釉等的生产过程中,为了确保产品不变形、强度(断裂模数)高以及达到一定的合格率,往往需要将坯体中的Al2O3含量控制到19~22%之间。在成品瓷质釉面砖中,Al2O3以莫来石和玻璃相的形式存在,其中,莫来石相能提升强度;并且,维持玻璃相与莫来石相的平衡则可有效消除应力,控制烧成瓷砖的变形。
在传统的陶瓷原料中,Al2O3的来源有三类:第一类是粘土类原料,如高岭土、膨润土、黑泥、白泥,水洗土等;第二类是熔剂类原料,如钾长石、钠长石以及各类砂料;第三类是一些高铝类的原料,如铝矾土、莫来石、氧化铝等。为了维持低铝高硅高强度不变形釉面砖坯体中的Al2O3含量在19~22%之间,往往需要添加铝矾土或者采用大量的粘土类原料(占比25~40%);然而,铝矾土会大幅提升烧成温度,延长烧成时间;此外,由于我国优质高岭土原料的逐步枯竭和生态环保政策的逐步落实,高岭土黑泥等优质高氧化铝含量原料,越来越稀缺。因此,急需考虑降低低铝高硅高强度不变形釉面砖中的Al2O3含量。
然而,当降低Al2O3含量后,坯体中莫来石含量相应降低,导致烧成过程中应力积累较大,容易出现变形;尤其是在烧成后放置7天以后,极易出现变形 (又称呼为返变)。同时,降低Al2O3含量后,烧成产物强度降低;此外,也会导致坯釉适配性下降,导致边裂。
发明内容
本发明所要解决的技术问题在于,提供一种低铝高硅高强度不变形釉面砖,其氧化铝含量低,且强度高,变形量小,合格率高。
本发明还要解决的技术问题在于,提供一种上述低铝高硅高强度不变形釉面砖的制备方法。
为了解决上述问题,本发明提供了一种低铝高硅高强度不变形釉面砖,包括坯体和设于坯体上的釉面;所述坯体主要由以下重量百分比的原料制成:
钠石粉8~12份、钾钠石粉35~42份、高温砂2~5份、中温砂10~15份、添加剂0.1~5份、黑坭3~8份、高岭土7~12份、水洗坭12~17份、滑石2~4 份;上述原料重量份之和为100份;
其中,所述坯体中,Al2O3含量为15~17wt%;
所述添加剂中SiO2含量为73~76wt%,Al2O3含量为17~20wt%。
作为上述技术方案的改进,所述添加剂按照重量百分数计的化学成分为:
SiO2 73~76%,Al2O3 17~20%,Fe2O3 0.05~0.15%,TiO2 0.1~0.2%,CaO 0.1~0.2%,MgO 0.1~0.2%,K2O 1.5~2.0%,Na2O 0.3~0.5%,LOI 3.5-4.0%。
作为上述技术方案的改进,所述坯体中Al2O3含量为15~17wt%,烧失量为 2~4wt%。
作为上述技术方案的改进,所述坯体的原料还包括:增强剂0.1~1份,解胶剂0.1~1份。
作为上述技术方案的改进,所述坯体主要由以下重量份的原料制成:
钠石粉8~10份、钾钠石粉35~40份、高温砂2~5份、中温砂10~15份、添加剂1~5份、黑坭3~6份、高岭土10~12份、水洗坭12~15份、滑石2~3 份;上述原料重量份之和为100份;
相应的,本发明还公开了一种上述的低铝高硅高强度不变形釉面砖的制备方法,其包括:
(1)按照配方将各种原料混合均匀,得到混合料;
(2)将所述混合料球磨,得到浆料;
(3)将所述浆料喷雾干燥,得到粉料;
(4)将所述粉料压制,得到生坯;
(5)将所述生坯烘干、施釉;
(6)将步骤(5)得到的生坯烧成,得到低铝高硅高强度不变形釉面砖成品。
作为上述技术方案的改进,步骤(6)中,烧成制度为:
从室温升温至1150℃,升温速率为160~200℃/min;
从1150℃降温至T1,降温速率为6~10℃/min;
从T1升温至烧成温度,升温速率为40~80℃/min;
在烧成温度保温5~15min;
从烧成温度降温至T2,降温速率为90~150℃/min;
其中,T1为900~1100℃,烧成温度为1150~1170℃,T2为80~300℃。
实施本发明,具有如下有益效果:
1.本发明配方中粘土类原料含量低,且不采用高铝类原料;将氧化铝含量有效降低至15~17wt%。但为了弥补氧化铝含量低带来的缺陷,本发明在配方之中引入了较高量的滑石;使得本发明中的相图由传统的Na-K-Al-Si转换为 Na-K-Al-Si-Mg系相图,改变了高温固熔体的成分,促进了莫来石的析出,进而解决了因Al2O3含量降低带来的强度下降、变形上升、返变上升的问题,提升了合格率。
2.本发明引入了特定成分的添加剂,改善了坯体的膨胀系数,提升了坯体和釉料的适配特性;同时,也减少了烧成过程中的应力积累,有效防止了返变。
3.本发明的配方中,稀缺的坭类原料(黑坭、水洗坭)的含量为10~20份;低于现有瓷质釉面砖中的25~40%,降低了原料成本,为国家节省了大量资源。
4.本发明配方中,烧失量为3.5~4%,其可适应于快速烧成,大幅度缩短了烧成周期,提升了产量。本发明低铝高硅高强度不变形釉面砖的整体烧成周期为30~40min。并且,本发明中氧化铝含量低,适应于低温烧成,降低了烧成耗能。具体的,本发明中的烧成温度从传统的1225℃降低到1150~1170℃,节约烧成耗能10~20%。
5.本发明的烧成曲线由常规的梯度曲线调整为凹性烧成曲线,即前温高、中温低,从而能达到快速受热、充分氧化、提升莫来石析出量的效果,提升成品强度,降低烧成过程中的应力积累,防止烧成过程变形和后期返变。
附图说明
图1是本发明一种低铝高硅高强度不变形釉面砖的制备方法流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面对本发明作进一步地详细描述。
传统的瓷质釉面砖为了保证变形和强度,一般将Al2O3控制在19~22wt%左右,这就要求使用较多的粘土类原料或高铝类原料,导致烧成温度高,原料成本高。为了解决上述问题,本发明提供了一种低铝高硅高强度不变形釉面砖,其包括坯体和设于坯体上的釉面;其中,坯体主要由以下重量百分比的原料制成:
钠石粉8~12份、钾钠石粉35~42份、高温砂2~5份、中温砂10~15份、添加剂0.1~5份、黑坭3~8份、高岭土7~12份、水洗坭12~17份、滑石2~4份;上述原料重量份之和为100份。
基于上述配方,坯体中Al2O3含量为15~17wt%,MgO含量为2.5~4%,烧失(LOI)为2~4%。即将传统的Na-K-Al-Si系相图转换为Na-K-Al-Si-Mg系相图,改变了高温固熔体的成分,使得坯体中的氧化铝快速溶解到高温固溶体中,从而在氧化铝与熔融液的接触面上,游离二氧化硅与氧化铝结合,反应形成莫来石,促进了莫来石的析出;此外,这种反应所形成的莫来石多是二次莫来石,其莫来石柱长度较大,进而解决了因Al2O3含量降低带来的强度下降、变形上升、返变上升的问题,提升了合格率。
此外,在相图体系转变后,坯体的膨胀系数也发生了较大范围的变化;因此,本发明还引入了添加剂,并控制添加剂中SiO2含量为73~76wt%,Al2O3含量为17~20wt%;从而起到了调节膨胀系数的作用。同时也减少了烧成过程中的应力积累,防止了返变。此外,添加剂也可与滑石协同作用,促进Na-K-Al-Si 系相图中二次莫来石的析出。
此外,本发明通过降低坭类原料的含量(水洗坭、黑坭)达到降低Al2O3含量的目的。为了弥补降低坭类原料后生坯强度降低的问题,本发明的配方中还引入了增强剂0.1~1份,解胶剂0.1~1份,其可提升生坯强度,防止干燥裂。
具体的,在本发明低铝高硅高强度不变形釉面砖中配方中,钠石粉的主要矿相为钠长石,也常常掺杂少量的石英、钾长石、斜长石等(自然界中难以寻求纯矿石)。本发明中钠石粉中,Na2O含量为6~10wt%。该成分的钠石粉对于形成Na-K-Al-Si-Mg系相图具有积极作用,可有效调节高温熔融相成分,降低应力积累。
钾钠石粉的主要矿相为微斜长石、钾长石,也常常掺杂一些石英、钠长石等矿相。本发明的钾钠石粉中,K2O的含量为4~10wt%,Na2O的含量为2~5wt%。该成分的钾钠石粉对于形成Na-K-Al-Si-Mg系相图具有积极作用,可有效调节高温熔融相成分,降低应力积累。
高温砂的主要矿相是石英、高岭石、云母,也会掺杂一些钾长石、钠长石、斜长石等。其主要起到骨料的作用中,也能析出少量莫来石,提升强度。在本发明中,高温砂中Al2O3含量为19~22%,K2O和Na2O的含量之和为0.1~3wt%;此成分范围的高温砂在烧成时,可提供氧化铝和游离的二氧化硅,氧化铝可熔于熔融液,进而使得游离二氧化硅与熔于熔融液的氧化铝反应形成二次莫来石。
中温砂的主要矿相是与高温砂相同,但其各个矿相的含量不同,导致其化学成分与高温砂不同;中温砂中Al2O3含量为17~20wt%,K2O和Na2O的含量之和为2~6wt%;其在烧成过程中更多的起到调节高温熔融相的作用,同时也可析出少量莫来石。
黑坭是主要的粘土类矿物,更具体的,其属于球土类粘土;其主要的矿相为高岭土、石英、云母,以及一些有机质。黑坭是主要的Al2O3、莫来石来源之一;同时黑坭可塑性较高,可提升生坯强度,防止裂纹。具体的,本发明中黑坭结合强度为3~5MPa。本发明将黑坭的含量降低至3~8份,有效降低了原料成本。
水洗坭是另一种主要的粘土矿物,其是由原矿坭(黑坭或白泥等)经过去砂、有机物后压滤而成。水洗坭也是主要的Al2O3、莫来石来源之一;但由于其经过水洗,可塑性较低,其结合强度为0.1~1.5MPa。
高岭土也是一种主要的粘土矿物,在自然界中,高岭土矿物通常与石英、云母伴生。高岭土是Al2O3、莫来石来源之一。具体的,在本发明中,高岭土中 Al2O3含量为25~35wt%。
具体的,在本发明低铝高硅高强度不变形釉面砖中配方中,滑石的含量为 2.5~4份;在传统的配方中,滑石的含量一般在1.5%以下,本发明增加了滑石含量,其可使得本发明中的相图由传统的Na-K-Al-Si系相图转换为Na-K-Al-Si-Mg 系相图,改变了高温固熔体的成分,使得坯体中的氧化铝快速溶解到高温固溶体中,从而在氧化铝与熔融液的接触面上,游离二氧化硅与氧化铝结合,反应形成莫来石,促进了莫来石的析出;此外,这种反应所形成的莫来石多是二次莫来石,其莫来石柱长度较大,进而解决了因Al2O3含量降低带来的强度下降、变形上升、返变上升的问题,提升了合格率。同时,滑石可有效调节高温熔融相成分,降低应力积累。
此外,本发明的配方之中还引入了添加剂,其化学成分为SiO2 73~76%, Al2O317~20%,Fe2O3 0.05~0.15%,TiO2 0.1~0.2%,CaO 0.1~0.2%,MgO 0.1~0.2%, K2O1.5~2.0%,Na2O 0.3~0.5%,LOI 3.5-4.0%。本发明中的添加剂可改善坯体的膨胀系数,提升了坯体和釉料的适配性,降低了边裂缺陷;同时,也减少了烧成过程中的应力积累,有效防止了返变。此外,本发明的添加剂可代替普通高铝材料。
相应的,参考图1,本发明还公开了一种上述低铝高硅高强度不变形釉面砖的制备方法,其包括以下步骤:
S1:按照配方将各种原料混合均匀,得到混合料;
具体的,将钠石粉8~12份、钾钠石粉35~42份、高温砂2~5份、中温砂 10~15份、添加剂0.1~5份、黑坭3~8份、高岭土7~12份、水洗坭12~17份、滑石2~4份混合均匀,得到混合料。
S2:将所述混合料球磨,得到浆料;
在球磨过程中,加入增强剂0.1~1份,解胶剂0.1~1份;球磨后,浆料的细度控制为250目筛筛余<1wt%。
S3:将所述浆料喷雾干燥,得到粉料;
S4:将所述粉料压制,得到生坯;
S5:将所述生坯烘干、施釉;
S6:将S5得到的生坯烧成,得到釉面砖成品。
具体的,烧成制度为:
从室温升温至1150℃,升温速率为160~200℃/min;
由于本发明的配方的烧失为4%以下,使得本发明在前序氧化段可采用很高的升温速率。
从1150℃降温至T1,降温速率为6~10℃/min;
具体的,T1为900~1100℃。在此阶段降温,可促进莫来石相的形成。具体的,为了培育莫来石晶粒的成长,应尽量避免快速升温导致脱离莫来石晶相生长温度范围,因此,本发明适当延长了坯体在900~1150℃阶段的停留时间,从而提升莫来石相析出量。优选的是,本发明在此阶段采用了降温的方法,这就使得形成的莫来石晶粒大幅度细化,较小的莫来石晶粒可更佳有效地提升强度,减小热应力的积累。
从T1升温至烧成温度,升温速率为40~80℃/min;
具体的,烧成温度为1150~1170℃,本发明的低铝高硅高强度不变形釉面砖配方,其烧成温度更低,节省能量。
在烧成温度保温5~15min;
从烧成温度降温至T2,降温速率为90~150℃/min;
具体的,T2为80~300℃。
进一步的,通过上述烧成曲线后,本发明中低铝高硅高强度不变形釉面砖的烧成周期可控制在30~40min;相比传统的50~80min,缩短了20~30%。
下面结合具体实施例说明本发明。
实施例1
本实施例提供一种低铝高硅高强度不变形釉面砖,其包括坯体层和釉料层。
其中,坯体层的配方为:
钠石粉10份、钾钠石粉36份、高温砂4份、中温砂13份、添加剂4份、黑坭6份、高岭土10份、水洗坭14份、滑石3份;解胶剂0.6份,增强剂 0.5份。
其中,钠石粉中Na2O的含量为8.5wt%,钾钠石粉中K2O的含量为6.2wt%, Na2O的含量为4.5wt%;高温砂中Al2O3含量为20.1%,K2O和Na2O的含量之和为1.5wt%;中温砂中Al2O3含量为18.2wt%,K2O和Na2O的含量之和为4.5 wt%;黑坭结合强度为4.8MPa,水洗坭的结合强度为0.5MPa;高岭土中Al2O3含量为32.6wt%;
添加剂的化学成分为:
SiO2 74.6%,Al2O3 19.1%,Fe2O3 0.1%,TiO2 0.1%,CaO 0.1%,MgO 0.1%,K2O 1.85%,Na2O 0.36%,LOI 3.62%。
解胶剂选用三聚磷酸钠,增强剂选用PVA。
其制备方法为:
(1)按照配方将各种原料混合均匀,得到混合料;
(2)将所述混合料球磨,得到浆料;
(3)将所述浆料喷雾干燥,得到粉料;
(4)将所述粉料压制,得到生坯;
(5)将所述生坯烘干、施釉;
(6)将步骤(5)得到的生坯烧成,得到低铝高硅高强度不变形釉面砖成品。
其中,烧成制度为:
从室温升温至1150℃,升温速率为180℃/min;
从1150℃降温至1100℃,降温速率为8℃/min;
从1100℃升温至1160℃,升温速率为55℃/min;
在1160℃保温10min;
从1160℃降温至200℃,降温速率为100℃/min。
实施例2
本实施例提供一种低铝高硅高强度不变形釉面砖,其包括坯体层和釉料层。
其中,坯体层的配方为:
钠石粉10份、钾钠石粉39份、高温砂3.5份、中温砂14份、添加剂4.5 份、黑坭5份、高岭土8份、水洗坭12.5份、滑石3.5份;解胶剂0.5份,增强剂0.8份。
其中,钠石粉中Na2O的含量为8.5wt%,钾钠石粉中K2O的含量为6.2wt%, Na2O的含量为4.5wt%;高温砂中Al2O3含量为20.1%,K2O和Na2O的含量之和为1.5wt%;中温砂中Al2O3含量为18.2wt%,K2O和Na2O的含量之和为4.5 wt%;黑坭结合强度为4.8MPa,水洗坭的结合强度为0.5MPa;高岭土中Al2O3含量为32.6wt%;
添加剂的化学成分为:
SiO2 74.6%,Al2O3 19.1%,Fe2O3 0.1%,TiO2 0.1%,CaO 0.1%,MgO 0.1%,K2O 1.85%,Na2O 0.36%,LOI 3.62%。
解胶剂选用三聚磷酸钠,增强剂选用PVA。
其制备方法为:
(1)按照配方将各种原料混合均匀,得到混合料;
(2)将所述混合料球磨,得到浆料;
(3)将所述浆料喷雾干燥,得到粉料;
(4)将所述粉料压制,得到生坯;
(5)将所述生坯烘干、施釉;
(6)将步骤(5)得到的生坯烧成,得到低铝高硅高强度不变形釉面砖成品。
其中,烧成制度为:
从室温升温至1150℃,升温速率为165℃/min;
从1150℃降温至1000℃,降温速率为10℃/min;
从1050℃升温至1165℃,升温速率为75℃/min;
在1165℃保温8min;
从1165℃降温至200℃,降温速率为145℃/min。
实施例3
本实施例提供一种低铝高硅高强度不变形釉面砖,除烧成制度外,其坯体配方以及制备方法与实施例2相同;
其中,烧成制度为:
从室温升温至1150℃,升温速率为190℃/min;
从1150℃降温至1100℃,降温速率为6℃/min;
从1050℃升温至1155℃,升温速率65℃/min;
在1155℃保温13min;
从1155℃降温至150℃,降温速率为120℃/min。
对比例1
本对比例提供一种低铝高硅高强度不变形釉面砖,其配方与原料与实施例2 相同;
其制备方法中,烧成制度与实施例2不同;
具体的烧成制度如下:
从室温到900℃,升温速率为55℃/min;
从900℃到1165℃,升温速率为20℃/min;
在1165℃保温14min;
从1165到200℃,降温速率为90℃/min;
对比例2
本对比例提供一种低铝高硅高强度不变形釉面砖,其配方如下:
钠石粉10份、钾钠石粉39份、高温砂3.5份、中温砂14份、铝矾土4.5 份、黑坭5份、高岭土8份、水洗坭12.5份、滑石3.5份;解胶剂0.5份,增强剂0.8份。
其中,钠石粉中Na2O的含量为8.5wt%,钾钠石粉中K2O的含量为6.2wt%, Na2O的含量为4.5wt%;高温砂中Al2O3含量为20.1%,K2O和Na2O的含量之和为1.5wt%;中温砂中Al2O3含量为18.2wt%,K2O和Na2O的含量之和为4.5 wt%;黑坭结合强度为4.8MPa,水洗坭的结合强度为0.5MPa;高岭土中Al2O3含量为32.6wt%;解胶剂选用三聚磷酸钠,增强剂选用PVA。
对比例3
本对比例提供一种低铝高硅高强度不变形釉面砖,其配方与对比例2相同;
其制备方法与对比例1相同。
将实施例1~3,对比例1~3按照标准GB/T 3810-2016中的方法做检测,其结果如下(其中,低铝高硅高强度不变形釉面砖的规格为800×800mm2):
坯体Al<sub>2</sub>O<sub>3</sub> | 吸水率 | 断裂模数 | 烧成温度 | 烧成周期 | |
实施例1 | 16.82% | 0.09% | 50.5MPa | 1160℃ | 35min |
实施例2 | 15.67% | 0.05% | 53.6MPa | 1165℃ | 40min |
实施例3 | 15.67% | 0.1% | 52.8MPa | 1155℃ | 40min |
对比例1 | 15.67% | 0.12% | 38.2MPa | 1165℃ | 45min |
对比例2 | 21.39% | 0.94% | 40.15MPa | 1165℃ | 40min |
对比例3 | 21.39% | 0.56% | 37.4MPa | 1165℃ | 45min |
由表中可以看出,本发明的低铝高硅高强度不变形釉面砖,其在 1160~1165℃烧结后,仍然吸水率可以达到0.1%以下,且断裂模数达到42MPa 以上;并且烧成周期在35~40min。而仅与本发明实施例2同样配方的对比例1 中,由于烧成制度的不同,导致其吸水率较大(>0.1%),断裂模数较小;仅采用本发明实施例2中烧成曲线的对比例2,则坯体无法烧熟,坯体吸水率为 0.94%,为炻瓷质;但通过对比例2与对比例3的对比可以看出,对比例2的断裂模数大于对比例3的;这表明本发明中的烧成曲线具有提升强度的作用。
实施例3烧成开裂率、合格率的测定
压制500片低铝高硅高强度不变形釉面砖坯体,干燥、施釉、烧成;
烧成后,边角有肉眼可见的,计为开裂、不合格;
烧成后,有肉眼可见明显翘曲或下拱的,或者断裂的,计为不合格;
除以上情况外,否则计为合格;
烧成后,选取10片合格的低铝高硅高强度不变形釉面砖,测定边弯曲度。
测定结果如下表:
实施例2 | 对比例1 | 对比例2 | |
边弯曲度/% | 0.18 | 0.33 | 0.28 |
合格率/% | 97.5 | 86.8 | 88.5 |
需要说明的是,本发明中的边弯曲度均是按照标准方法测试后,取绝对值。
实施例4返变情况的测定
将实施例3中100片合格的低铝高硅高强度不变形釉面砖在测试边弯曲度以后,存贮到仓库;15日后取出,进行边弯曲度测定;
实施例2 | 对比例1 | 对比例2 | |
放置前边弯曲度/% | 0.18 | 0.33 | 0.28 |
放置前边弯曲度/% | 0.21 | 0.55 | 0.65 |
变化率 | 16.67% | 66.67% | 132.1% |
由表中可以看出,本发明的返变率相对较小;而对比例1与对比例2的返变率则较高。
以上所述是发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也视为本发明的保护范围。
Claims (3)
1.一种低铝高硅高强度不变形釉面砖,包括坯体和设于坯体上的釉面;其特征在于,所述坯体主要由以下重量份的原料制成:
钠石粉 8~12份、钾钠石粉 35~42份、高温砂 2~5份、中温砂 10~15份、添加剂0.1~5份、黑坭 3~8份、高岭土 7~12份、水洗坭 12~17份、滑石 2~4份;以上原料重量份之和为100份;
其中,所述坯体中,Al2O3含量为15~17 wt%,MgO含量为2.5~4wt%,烧失量为2~4wt%;
所述添加剂按照重量百分数计的化学成分为:
SiO2 73~76%,Al2O3 17~20%,Fe2O3 0.05~0.15%,TiO2 0.1~0.2%,CaO 0.1~0.2%,MgO0.1~0.2%,K2O 1. 5~2.0%,Na2O 0.3~0.5%,LOI 3.5-4.0%;
所述低铝高硅高强度不变形釉面砖的制备方法包括:
(1)按照配方将各种原料混合均匀,得到混合料;
(2)将所述混合料球磨,得到浆料;
(3)将所述浆料喷雾干燥,得到粉料;
(4)将所述粉料压制,得到生坯;
(5)将所述生坯烘干、施釉;
(6)将步骤(5)得到的生坯烧成,得到低铝高硅高强度不变形釉面砖成品;
其中,步骤(6)中,烧成制度为:
从室温升温至1150℃,升温速率为160~200℃/min;
从1150℃降温至T1,降温速率为6~10℃/min;
从T1升温至烧成温度,升温速率为40~80℃/min;
在烧成温度保温5~15 min;
从烧成温度降温至T2,降温速率为90~150℃/min;
其中,T1为900~1100℃,烧成温度为1150~1170℃,T2为80~300℃。
2.如权利要求1所述的低铝高硅高强度不变形釉面砖,其特征在于,所述坯体的原料还包括:增强剂0.1~1份,解胶剂0.1~1份。
3.如权利要求1所述的低铝高硅高强度不变形釉面砖,其特征在于,所述坯体主要由以下重量份的原料制成:
钠石粉 8~10份、钾钠石粉 35~40份、高温砂 2~5份、中温砂 10~15份、添加剂1~5份、黑坭 3~6份、高岭土10~12份、水洗坭 12~15份、滑石 2~3份;以上原料重量份之和为100份。
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