CN116496101A - 一种低导热微闭孔富铝尖晶石材料及其制备方法 - Google Patents
一种低导热微闭孔富铝尖晶石材料及其制备方法 Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 71
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 68
- 239000011029 spinel Substances 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 239000011812 mixed powder Substances 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 229920002472 Starch Polymers 0.000 claims abstract description 14
- 235000019698 starch Nutrition 0.000 claims abstract description 14
- 239000008107 starch Substances 0.000 claims abstract description 14
- 239000011777 magnesium Substances 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 239000011819 refractory material Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 238000000498 ball milling Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000001095 magnesium carbonate Substances 0.000 claims description 7
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 7
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 7
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 229910052599 brucite Inorganic materials 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 21
- 230000008569 process Effects 0.000 abstract description 12
- 239000002893 slag Substances 0.000 abstract description 8
- 238000009776 industrial production Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 13
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
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- 238000005245 sintering Methods 0.000 description 4
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- 150000001768 cations Chemical class 0.000 description 3
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- 239000002002 slurry Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052566 spinel group Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
本发明公开了一种低导热微闭孔富铝尖晶石材料及其制备方法,涉及耐火材料技术领域。所述材料制备方法包括将80~90质量份铝源、10~20质量份镁源、0.3~2质量份纳米添加剂和5~20质量份淀粉造孔剂混合,加入60~80质量份的水,混匀,烘干,球磨;然后在混合粉体中加入1~3质量份的粘结剂,混匀,机压成型;于80~110℃条件下固化干燥12~24小时,在1700~1900℃保温1~6小时,自然冷却,即得。本发明制备方法工艺简单、成本低廉、适合工业化生产,所得低导热微闭孔富铝尖晶石材料呈现单一富铝尖晶石相,具有显气孔率低、闭口气孔率较高、孔径较小、热导率较低、抗熔渣性能好及热震稳定性能较强的特点。
Description
技术领域
本发明涉及耐火材料技术领域,更具体的说是涉及一种低导热微闭孔富铝尖晶石材料及其制备方法。
背景技术
耐火材料是保证高温工业运行和技术发展必不可少的基础材料,对高温过程节能减排具有关键作用,随着科技发展,现代高温工业亟需提供具有隔热、长寿、高效、经济、安全的优质耐火材料作为保障。因此,开发低导热长寿型高品质耐火材料,支撑高温工业绿色低碳高质量发展,迫在眉睫。
“重质耐火材料轻量化”是提升高温炉衬隔热性能的重要途径。通过引入具有一定气孔率的轻量耐火骨料代替传统致密骨料,可以降低耐火材料的热容量和导热系数,达到保温隔热、节能降耗的目的。Al2O3-MgO质耐火材料是耐火材料中重要的品种,被广泛地应用于冶金、建材、石化等行业。其中,当MgO/Al2O3比小于1时(即富铝尖晶石),材料中存在大量Mg2+离子空位,能吸收大量的金属阳离子(Fe3+、Fe2+、Mn2+等),且易于渣反应生成CA6、CA2等矿物相,从而增大渣的粘度,抑制渣的渗透,适合由于钢包内衬浇注料、透气转、座砖等部位。因此,制备可在工作层使用的低导热微闭孔富铝尖晶石材料有着良好的应用前景。
目前,低导热微闭孔富铝尖晶石材料制备的主要难点在于两个方面。第一,富铝镁铝尖晶石的形成通常依赖于较高活性的原料、高温、高压等环境。目前制备耐火材料时采用的原料活性通常较低,导致高温下反应不充分、形成的固溶体晶格不稳固,冷却过程中较易发生脱溶,最终成为复相材料。“一种富铝尖晶石及其制备方法”(CN 114685171A)专利技术,将活性氧化铝、镁源、金属卤化物及氧化锆分散混合后搅拌成浆料,将浆料喷雾干燥后在1000~1500℃下煅烧7~10h制备得到富铝尖晶石,但流程复杂成本较高,且得到的富铝尖晶石为尖晶石-刚玉复相。“一种高纯度富铝铝镁尖晶石的制备方法”(CN114804168A)专利技术,以γ相氧化铝细粉和结晶氧化镁细粉为原料经过预热后,利用富含二氧化碳的水幕喷淋制得浆料并压滤成滤饼,经过热处理后自然冷却得到富铝尖晶石,但采用工艺较复杂,生产成本高,不适用于耐火材料的生产。第二,材料烧结过程中,Al2O3、MgO组分反应会伴随较大的体积变化,如何减小体积变化带来的不利影响,并形成微-纳米尺度闭合孔结构。“纳米孔径的多孔刚玉-镁铝尖晶石陶瓷及其制备方法”(ZL201710632852.6)专利技术以氢氧化铝细粉、氯化镁溶液和菱镁矿微粉为原料,采用原位分解法制备得到了纳米孔径的多孔刚玉-镁铝尖晶石陶瓷,但是显气孔率过大,对于材料抗熔渣性能不利。
因此,如何提供一种工艺简单、显气孔率低的低导热微闭孔富铝尖晶石材料是本领域技术人员亟需解决的问题。
发明内容
本发明旨在克服现有技术缺陷,任务是提供一种低导热微闭孔富铝尖晶石材料的制备方法。该制备方法工艺简单、成本低廉、适合工业化生产,用该方法制备的低导热微闭孔富铝尖晶石材料呈现单一富铝尖晶石相,显气孔率低、闭口气孔率较高、孔径较小、热导率较低、抗熔渣性能好及热震稳定性能较强。为了实现上述目的,本发明采用如下技术方案:
一种低导热微闭孔富铝尖晶石材料,包括以下质量份的原料:80~90份铝源、10~20份镁源、0.3~2份纳米添加剂、5~20份淀粉造孔剂、1~3份粘结剂和60~80水;
其中,所述铝源为工业氧化铝、活性α-Al2O3和γ-Al2O3中的一种或多种;
所述镁源为菱镁矿、镁砂和水镁石中的一种或多种;
所述纳米添加剂为纳米氧化锆、纳米氧化锌和纳米氧化钛中的一种或多种;
所述粘结剂为聚乙二醇和聚乙烯醇中的一种或多种。
作为优选的技术方案,所述铝源的Al2O3含量>99wt%、粒径D50为1~10μm;所述镁源粒径D50为3~10μm;所述淀粉造孔剂的粒径D50为10~40μm;所述纳米添加剂粒径D50为20~100nm。
本发明的另一目的是,提供上述低导热微闭孔富铝尖晶石材料的制备方法,包括以下步骤:
S1:将80~90质量份铝源、10~20质量份镁源、0.3~2质量份纳米添加剂和5~20质量份淀粉造孔剂混合,加入60~80质量份的水,混匀,烘干,球磨,得混合粉体;
S2:在混合粉体中加入1~3质量份的粘结剂,混匀,机压成型;
S3:于80~110℃条件下固化干燥12~24小时,在1700~1900℃保温1~6小时,自然冷却,制得低导热微闭孔富铝尖晶石材料。
作为优选的技术方案,S1所述烘干的温度为110℃。
作为优选的技术方案,S2所述机压成型的压强为50~150MPa。
本发明的又一目的是,提供一种权利要求1或2所述低导热微闭孔富铝尖晶石材料或权利要求3-5任一所述制备方法制备的低导热微闭孔富铝尖晶石材料的应用。
作为优选的技术方案,所述应用为下列之一:
A制备耐火材料;
B制备隔热材料。
经由上述的技术方案可知,本发明与现有技术相比具有如下积极效果:
(1)本发明引入纳米添加剂,一方面,与尖晶石置换固溶产生阳离子空位,提高烧结活性与固溶程度,此外,纳米添加剂钉扎作用可以防止富铝尖晶石在冷却过程中发生脱溶而转变为复相材料,从而稳固富铝尖晶石晶格,获得单一富铝尖晶石相;另一方面,在烧结过程中,在纳米添加剂对颈部应力的促进作用下,使得晶界快速扩散,并将气孔封闭在晶粒内部,形成闭口气孔。在两方面作用下,获得显气孔率低、闭口气孔率高、具有单一富铝尖晶石相材料。
(2)本发明所制备的低导热微闭孔富铝尖晶石材料中呈现单一富铝尖晶石相,其本质是一种固溶体,固溶体中溶剂与溶质的性质不一致,导致晶体结构变化,声子散射程度增大,声子自由程减小,也会降低材料的导热系数。此外,材料中含有大量微-纳米尺度闭合孔结构,也可以降低材料导热系数。因此,本发明所制备的材料具有导热系数低的特点。
(3)由于微-纳米尺度闭合孔与外界接触面积较小以及尖晶石可以将大量的金属阳离子(Fe3+、Fe2+、Mn2+等)吸收到结构中形成广泛固溶体的特性,因此保证了材料具有优良的抗熔渣性能;此外,细小且分布均匀的闭口气孔能够抵消高温下材料热膨胀带来的体积效应,且单一相的富铝尖晶石使得材料热膨胀系数不匹配得到缓解,从而提升材料的热震稳定性能。
(4)本发明所用原料均为常见原料,来源广泛,且价格低廉;采用一次成型、烧成的工艺制备低导热微闭孔富铝尖晶石材料,整体生产流程简单,生产效率高,生产过程中对设备的要求较低;具有工艺简单、成本低廉、适合工业化生产的特点。
本发明所制备的低导热微闭孔富铝尖晶石材料经检测:体积密度为3.1~3.35g/cm3,显气孔率为1.4~5.6%,闭气孔率为7.5~12.8%,平均孔径为2.3~4.8μm,800℃下导热系数为2.6~3.2W/(m·K)。
因此,本发明所提供的低导热微闭孔富铝尖晶石材料制备方法工艺简单、成本低廉、适合工业化生产,用该方法制备的低导热微闭孔富铝尖晶石材料呈现单一富铝尖晶石相,具有显气孔率低、闭口气孔率较高、孔径较小、热导率较低、抗熔渣性能好及热震稳定性能较强的特点。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据提供的附图获得其他的附图。
图1是本发明实施例1制备的一种低导热微闭孔富铝尖晶石材料的XRD图谱;
图2是本发明实施例1制备的一种低导热微闭孔富铝尖晶石材料的二次电子图;
图3是本发明实施例4制备的另一种低导热微闭孔富铝尖晶石材料的二次电子图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明实施例公开了一种低导热微闭孔富铝尖晶石材料的制备方法,所用原料均为市售可得,对其来源不做具体限定。所用方法如无特别提及,均为常规方法,在此不再一一赘述。本发明实施例所涉及铝源的粒径D50为1~10μm,所述镁源的粒径D50为3~10μm,所述淀粉造孔剂的粒径D50为10~40μm,所述纳米添加剂粒径D50为20~100nm。
实施例1
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将90质量份的工业氧化铝微粉、10质量份的菱镁矿微粉、0.5质量份的纳米氧化锆以及10质量份的淀粉添加剂混合,加入70质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入1质量份的聚乙烯醇,混匀,在100MPa下机压成型;
步骤三、于110℃条件下固化干燥12小时,在1780℃保温3小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石;
本实施例所制备的低导热微闭孔富铝尖晶石经检测:体积密度为3.25g/cm3;显气孔率为3.2%;闭气孔率为11.8%;平均孔径为3.8μm;800℃时导热系数为2.9W/(m·K)。
实施例2
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将85质量份的活性α-Al2O3微粉、15质量份的镁砂微粉、0.3质量份的纳米氧化钛以及10质量份的淀粉添加剂混合,加入70质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入1质量份的聚乙烯醇,混匀,在150MPa下机压成型;
步骤三、于110℃下干燥固化12小时,在1750℃保温3小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石。
本实施例所制备的低导热微闭孔富铝尖晶石经检测:体积密度为3.20g/cm3;显气孔率为4.6%;闭气孔率为10.2%;平均孔径为4.8μm;800℃时导热系数为3.1W/(m·K)。
实施例3
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将90质量份的工业氧化铝微粉和γ-Al2O3微粉的混合粉体、10质量份的水镁石微粉、1.5质量份的纳米氧化锆和纳米氧化钛的混合粉体、以及15质量份的淀粉添加剂混合,加入80质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入1质量份的聚乙二醇,混匀,在120MPa下机压成型;并在80℃下干燥固化;
步骤三、于110℃下干燥固化12小时,在1800℃保温3小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石。
本实施例所制备的本实施例所制备的低导热微闭孔富铝尖晶石经检测:体积密度为3.26g/cm3;显气孔率为1.8%;闭气孔率为12.8%;平均孔径为2.3μm;800℃时导热系数为2.8W/(m·K)。
实施例4
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将80质量份的工业氧化铝微粉、20质量份的水镁石微粉和菱镁矿微粉混合粉体、1质量份的纳米氧化锌以及5质量份的淀粉添加剂混合,加入60质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入3质量份的聚乙烯醇,混匀,在150MPa下机压成型;
步骤三、于80℃下干燥固化24小时,在1800℃保温2小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石。
本实施例所制备的低导热微闭孔富铝尖晶石经检测:体积密度为3.35g/cm3;显气孔率为1.4%;闭气孔率为7.5%;平均孔径为2.9μm;800℃时导热系数为3.2W/(m·K)。
实施例5
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将90质量份的工业氧化铝微粉和活性α-Al2O3微粉及γ-Al2O3微粉的混合粉体、10质量份的水镁石微粉和镁砂微粉及菱镁矿微粉混合粉体、2质量份的纳米氧化锆和纳米氧化钛及纳米氧化锌的混合粉体、以及20质量份的淀粉添加剂混合,加入70质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入3质量份的聚乙二醇,混匀,在100MPa下机压成型;
步骤三、于80℃下干燥固化24小时,在1700℃保温6小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石。
本实施例所制备的微米闭孔富铝尖晶石经检测:体积密度为3.1g/cm3;显气孔率为5.6%;闭气孔率为12.0%;平均孔径为3.1μm;800℃时导热系数为2.6W/(m·K)。
实施例6
一种低导热微闭孔富铝尖晶石及其制备方法:
步骤一、将85质量份的γ-Al2O3微粉、15质量份的菱镁矿微粉、0.75质量份的纳米氧化锆以及10质量份的淀粉添加剂混合,加入60质量份的水,经30分钟混匀,110℃条件下烘干,30分钟球磨,得混合粉体;
步骤二、在混合粉体中加入1.5质量份的聚乙烯醇,混匀,在120MPa下机压成型;
步骤三、于110℃下干燥固化24小时,在1900℃保温1小时,自然冷却,制得本实施例的低导热微闭孔富铝尖晶石;
本实施例所制备的低导热微闭孔富铝尖晶石经检测:体积密度为3.18g/cm3;显气孔率为2.2%;闭气孔率为10.4%;平均孔径为2.6μm;800℃时导热系数为2.8W/(m·K)。
本说明书中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (7)
1.一种低导热微闭孔富铝尖晶石材料,其特征在于,包括以下质量份的原料:80~90份铝源、10~20份镁源、0.3~2份纳米添加剂、5~20份淀粉造孔剂、1~3份粘结剂和60~80水;
其中,所述铝源为工业氧化铝、活性α-Al2O3和γ-Al2O3中的一种或多种;
所述镁源为菱镁矿、镁砂和水镁石中的一种或多种;
所述纳米添加剂为纳米氧化锆、纳米氧化锌和纳米氧化钛中的一种或多种;
所述粘结剂为聚乙二醇和聚乙烯醇中的一种或多种。
2.根据权利要求1所述低导热微闭孔富铝尖晶石材料,其特征在于,所述铝源的Al2O3含量>99wt%、粒径D50为1~10μm;所述镁源粒径D50为3~10μm;所述淀粉造孔剂的粒径D50为10~40μm;所述纳米添加剂粒径D50为20~100nm。
3.权利要求1或2所述低导热微闭孔富铝尖晶石材料的制备方法,其特征在于,包括以下步骤:
S1:将80~90质量份铝源、10~20质量份镁源、0.3~2质量份纳米添加剂和5~20质量份淀粉造孔剂混合,加入60~80质量份的水,混匀,烘干,球磨,得混合粉体;
S2:在混合粉体中加入1~3质量份的粘结剂,混匀,机压成型;
S3:于80~110℃条件下固化干燥12~24小时,在1700~1900℃保温1~6小时,自然冷却,制得低导热微闭孔富铝尖晶石材料。
4.根据权利要求3所述的低导热微闭孔富铝尖晶石材料的制备方法,其特征在于,S1所述烘干的温度为110℃。
5.根据权利要求3所述的低导热微闭孔富铝尖晶石材料的制备方法,其特征在于,S2所述机压成型的压强为50~150MPa。
6.一种权利要求1或2所述低导热微闭孔富铝尖晶石材料或权利要求3~5任一所述制备方法制备的低导热微闭孔富铝尖晶石材料的应用。
7.根据权利要求6所述的应用,其特征在于,所述应用为下列之一:
A制备耐火材料;
B制备隔热材料。
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