CN112321306A - 一种镁质结合剂及使用镁质结合剂制备耐火材料的方法 - Google Patents
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Abstract
本发明提供一种镁质结合剂以及使用镁质结合剂制备耐火材料的方法,本发明以氧化镁,油酸镁和甲基丙二酸为结合剂组分,通过添加0.10‑0.15%的油酸镁和甲基丙二酸以及两者配比设置为1/1‑2/1,来控制氧化镁水化反应生成物氢氧化镁的显微组织结构,同时通过使用镁质结合剂制备耐火材料的实施过程,使镁质结合剂在耐火材料内部形成镶嵌式结构,大幅提高了镁质结合剂和耐火材料结合相的强度,添加了镁质结合剂试样的微观组织结构形貌呈锥状,其耐压强度可达到60-70MPa。本发明的镁质结合剂及其使用方法简单,制备成本低廉。
Description
技术领域
本发明涉及耐火材料及其制备技术领域,尤其涉及一种镁质结合剂以及使用镁质结合剂制备耐火材料的方法,可用来提高镁质结合剂与耐火材料的结合强度。
背景技术
氧化镁作为结合剂广泛应用于耐火材料、结构陶瓷以及建筑材料等领域。氧化镁结合剂的强度主要是通过氧化镁水化反应生成氢氧化镁相形成的,氧化镁结合剂的强度取决于在制备过程中氧化镁水化过程后的微观组织结构。传统的镁质结合剂只是单纯利用轻烧氧化镁与水之间的水化反应生成氢氧化镁并形成结合强度,但由于生成的氢氧化镁结合相的微观组织结构简单且单一,在此条件下只能生成片状氢氧化镁,结合相呈片状时试样的强度最低,为52.32MPa。因此,不能有效的在材料内部形成镶嵌式结构来满足实际使用要求。
发明内容
为克服现有技术的不足,本发明提供一种镁质结合剂以及提高镁质结合剂强度的制备方法。本发明通过控制镁质结合剂中的微观组织形貌,来达到提高镁质结合剂与耐火材料的结合强度。本发明的技术方案如下:
本发明的技术方案之一为一种镁质结合剂,其特点在于,所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85-99.90%、油酸镁:0.05-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。
进一步的,所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85%、油酸镁:0.075-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。
本发明按照所述镁质结合剂的组份及质量百分比进行原料的配比称重,其中,油酸镁与甲基丙二酸的配比为1/1-2/1,将所述称重原料配比放入搅拌机内搅拌均匀。
本发明的技术方案之二为一种使用镁质结合剂制备耐火材料的方法,将所述镁质结合剂加入到耐火原料中,制备步骤如下:
1)所述镁质结合剂的加入量以质量百分比计为耐火原料总量的2-10%,将所述镁质结合剂与耐火原料混合均匀;
2)在上述混合物中加水5-10%继续搅拌均匀成浆料,将所述浆料注入模具中成型;
3)成型后的所述耐火材料带模自然养护24h或以上即≥24h脱模,脱模后继续自然养护24h或以上即≥24h;
4)然后在烘箱中以200℃±10℃的温度,烘烤24h或以上即≥24h。
其中,加入所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85-99.90%、油酸镁:0.05-0.10%、甲基丙二酸:0.05-0.10%;当油酸镁与甲基丙二酸的配比为1/1-2/1时,可控制轻烧氧化镁水化产物-氢氧化镁在三维方向上的生长速度,进而达到控制镁质结合剂微观组织结构的目的。
本发明使用所述镁质结合剂所制备的耐火材料,其结合相微观结构为片状、锥状、块状、锥状+片状、块状+锥状、或片状+块状,其耐压强度为53-70MPa。当其结合相微观结构为锥状时,其耐压强度可达到60-70MPa。
本发明的优点和有益效果如下:
本发明所制备的镁质结合剂因可通过调节组成和配比,使之形成有利于提高结合强度的微观组织结构,因此,可大幅度提高镁质结合剂的强度,扩大应用范围。此外,通过在轻烧氧化镁中添加油酸镁与甲基丙二酸,还可以有效防止轻烧氧化镁吸潮结块,延长镁质结合剂的储藏时间。本发明的产品和使用实施方法简单,成本比较低廉。
附图说明
图1为现有技术未添加镁质结合剂试样的微观组织结构形貌。
图2为本发明添加了镁质结合剂试样的微观组织结构形貌。
具体实施方式
以下参照附图以及示例性实施例对本发明进行详细说明。以下附图中所示出的是优选实施例。为了清楚地说明本发明,附图中的结构尺寸和区域范围可能被放大或夸张,或者有些图形结构在文字说明清楚明了的情况下没有示出。但这些优选实施例和图形结构的大小并不限定本发明。
下面通过具体实施例详细说明本制备方法的实施过程。
本发明解决其技术问题时所采取的技术方案之一是提供一种镁质结合剂,该镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85-99.90%、油酸镁:0.05-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。将镁质结合剂的组份进行原料配比称重并放入搅拌机内搅拌均匀即可。
本发明还优选了如下镁质结合剂的成分组成,该组成以质量百分比计为:轻烧氧化镁≤0.074mm:99.85%、油酸镁:0.075-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸在成分组成中的配比为1/1。
本发明在使用氧化镁作为镁质结合剂的成分时,同时添加油酸镁和甲基丙二酸两种成分,并且通过调节和控制镁质结合剂制备过程中油酸镁和甲基丙二酸的添加比例,以及加入量来控制氧化镁水化生成物-氢氧化镁的微观组织结构形貌,以达到提高氢氧化镁结合相的强度,即达到提高镁质结合剂强度的目的。
本发明在使用镁质结合剂制备耐火材料的实施过程中,将镁质结合剂加入到耐火原料中,由于油酸镁和甲基丙二酸可以影响氢氧化镁的形核速度和结晶成长方向,因此可以通过调节油酸镁和甲基丙二酸的添加量,控制镁质结合剂中的微观组织结构形貌。在添加了油酸镁和甲基丙二酸后,氢氧化镁结合相的形核速度和结晶生长方向受到影响,微观组织结构随着油酸镁和甲基丙二酸以及添加量的变化由原来无添加时的片状向具有镶嵌结构的锥状转变,并且显著影响氢氧化镁结合相的强度。
本发明制备的镁质结合剂微观结构可呈现片状、锥状、块状、锥状+片状、块状+锥状、或片状+块状微观组织结构形貌,耐压强度可达到53-70MPa。当油酸镁和甲基丙二酸的配比为质量比在1/1-2/1,且添加量在0.10-0.15%时,其氢氧化镁结合相呈锥状,如图2所示,本发明添加了镁质结合剂试样的微观组织结构形貌呈锥状,其耐压强度可达到60-70MPa。
实施例1-6
本实施例采用刚玉质浇注料耐火材料,以镁质结合剂为结合剂。原料配比组成如表1所示。
表1原料配比组成
按表1所示的原料配比称重,配比总重量为1000g。将上述原料放入搅拌机内搅拌均匀,然后加水70g,继续搅拌10min后成浆料,然后将浆料注入模具中成型。成型后带模自然养护24h后脱模,脱模后继续自然养护24h,然后在烘箱中以200℃温度烘烤24h。烘干后的试样,依据GB/T5072-2008《耐火材料常温耐压强度试验方法》测量其耐压强度,利用电子显微镜观察试样断面的结合相微观组织结构,如下表2所示。
表2测量结果
由表2的测量及观察结果可见,从对比例以及图1和图2中可看出对比例和本发明之间的区别。在相同成分组成的试样试验下,对比例和图1未添加油酸镁和甲基丙二酸的试样的氢氧化镁结合相的微观组织结构形貌为片状结构。由于其不能在耐火材料内部形成镶嵌式结构,因此,强度较低。
而本发明表中的6个实施例,均为添加了油酸镁和甲基丙二酸的试样,其试样中氢氧化镁结合相的微观组织结构形貌为块状+锥状、锥状、锥状+片状、片状+锥状、锥状、锥状+片状。因此,影响氢氧化镁结合相微观组织结构的因素主要是油酸镁和甲基丙二酸的添加量和其添加比例。当轻烧氧化镁中的油酸镁和甲基丙二酸添加量为0.15%时,试样的结合强度在油酸镁/甲基丙二酸=1/1时达到最高。
在试验过程中,随着油酸镁和甲基丙二酸以及添加量的变化发生很大变化,可显著影响其微观组织结构形貌,从而影响其结合和耐压强度。如当油酸镁和甲基丙二酸的配比为质量比在1/1-2/1,且添加量在0.10-0.15%时其微观组织结构样貌呈锥状,试样的耐压强度达到最高。如实施例2的微观组织结构形貌为锥状,其耐压强度达到了68.65MPa。与现有技术相比,强度提高了31.32%。可见,采用本发明的方法可以大幅度提高镁质结合剂与耐火材料的结合强度。
以上仅是本发明的优选实施方式。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各种改进。这些改进也应视为本发明的保护范围。
Claims (8)
1.一种镁质结合剂,其特征在于,所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85-99.90%、油酸镁:0.05-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。
2.根据权利要求1所述的镁质结合剂,其特征在于,所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85%、油酸镁:0.075-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。
3.根据权利要求1或2所述的镁质结合剂,其特征在于,按照所述镁质结合剂的组份及质量百分比进行原料的配比称重,其中,油酸镁与甲基丙二酸的配比为1/1-2/1,将所述称重原料配比放入搅拌机内搅拌均匀。
4.一种使用镁质结合剂制备耐火材料的方法,其特征在于,将所述镁质结合剂加入到耐火原料中,制备步骤如下:
1)所述镁质结合剂的加入量以质量百分比计为耐火原料总量的2-10%,并与耐火原料混合均匀;
2)在上述混合物中加水5-10%继续搅拌均匀成浆料,将所述浆料注入模具中成型;
3)成型后的所述耐火材料带模自然养护24h或以上脱模,脱模后继续自然养护24h或以上,
4)然后在烘箱中以200℃±10℃的温度,烘烤24h或以上。
5.根据权利要求4所述的使用方法,其特征在于,加入所述镁质结合剂的组份以质量百分比计为:轻烧氧化镁≤0.074mm:99.85-99.90%、油酸镁:0.05-0.10%、甲基丙二酸:0.05-0.10%;其中,油酸镁与甲基丙二酸的配比为1/1-2/1。
6.根据权利要求4或5所述的使用方法,其特征在于,使用所述镁质结合剂所制备的耐火材料,其结合相微观结构为片状、锥状、块状、锥状+片状、块状+锥状、或片状+块状。
7.根据权利要求4或5所述的使用方法,其特征在于,使用所述镁质结合剂所制备的耐火材料,其耐压强度为53-70MPa。
8.根据权利要求6或7所述的使用方法,其特征在于,使用所述镁质结合剂所制备的耐火材料,当其结合相微观结构为锥状时,其耐压强度可达到60-70MPa。
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