CN1116228A - 氮化硼-硅酸盐密封剂 - Google Patents

氮化硼-硅酸盐密封剂 Download PDF

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CN1116228A
CN1116228A CN95105853A CN95105853A CN1116228A CN 1116228 A CN1116228 A CN 1116228A CN 95105853 A CN95105853 A CN 95105853A CN 95105853 A CN95105853 A CN 95105853A CN 1116228 A CN1116228 A CN 1116228A
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A·J·施塔沃斯
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Praxair S T Technology Co. Ltd.
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    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C24/08Coating starting from inorganic powder by application of heat or pressure and heat
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/583Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride
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    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003Apparatus
    • C23C2/0034Details related to elements immersed in bath
    • C23C2/00342Moving elements, e.g. pumps or mixers
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00Coating not provided for in groups C23C2/00 - C23C24/00
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process

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Abstract

本发明涉及一种含有氮化硼-硅酸盐的、具有优良的耐熔融锌等熔融金属浸蚀的密封剂和将该密封剂涂到基体上的方法。

Description

氮化硼-硅酸盐密封剂
本发明涉及氮化硼-硅酸盐密封剂,它对于熔融金属,特别是熔融锌具有优良的耐蚀性能,而且已被优选应用于热浸镀锌生产线中接触或浸渍在熔融金属锌中的部件。
熔融的锌对钢铁等金属具有浸蚀性,而且由于其表面张力和粘性很低,因而易渗入这些金属的微米级的孔隙中。已有人提出或使用一些改进抗熔融锌浸蚀的方法,例如揭示于公开的日本专利申请S56-112117号的特种钢和日本专利申请公开111-225761号的热喷涂WC-Co涂层。然而,这些技术都不能有效地耐受熔融锌的浸蚀。
现行各种耐熔融锌的钢,基本上都是铁基合金,并不能有效地耐受熔融锌的浸蚀,而其价格则远高于普通的结构钢。WC-Co和各种自助熔合金等涂层被用作为保护基体不受熔融锌浸蚀的热喷溅涂层,但由于熔融锌通过相互连通的孔隙渗透并对金属粘结剂的选择性浸蚀,因而不能有效地保护基体。
用于对镀锌生产线上熔融锌容器中使用的辊子起保护作用的某些密封剂,在运行时易在其表面积累氧化物、浮渣等等杂质。这些杂质积累使得钢条在辊上通过时被硌伤,结果使生产出的钢产品质量低。
本发明的目标,是给将用于接触或浸渍在熔融金属中的辊等物件提供一种氮化硼-硅酸盐密封剂,以防止熔融金属的浸蚀并最大限度减少氧化物和浮渣等等在物件表面和积累。这里所说的浮渣是指由铝、锌、铁等金属及其混合物所组成的金属间合金或化合物,但不限于这些。
本发明的另一个目标,是提供一种易于应用而且价廉的氮化硼-硅酸盐密封剂。
本发明涉及一种密封材料,它具有对熔融锌等熔融金属的改进的耐蚀性和憎湿性,因而是接触或运行于熔融锌、铝或锌-铝合金中辊等机件的理想的涂层结构材料。
本发明涉及一种密封材料,它具有对融熔锌的改进了的耐蚀性并且是憎湿性的。因而是接触或运行于熔融金属中机件的理想的结构材料或热喷涂层。
本发明的密封层,在熔锌池中已显示出极好的耐用性。它由下列过程形成:
(a)制备一种含氮化硼和硅化物的水溶液;
(b)将水溶液涂覆到被密封物件的表面;
(c)将涂膜的物件在适当的温度范围内加热,基本上除去涂膜
   中的水份。
因此,本发明首先是提供一种极好的抗熔融金属,特别是抗熔锌浸蚀的密封剂。其次,这种密封剂在接触或者用于锌等熔融金属时,与先有的密封剂相对比,能最大限度地降低氧化物和浮渣等的积累。本密封剂包括氮化硼和硅酸盐的水溶液,可用涂抹、热喷涂等喷涂或其它常规技术涂到物件表面。优选的密封剂水溶液的重量百分配比:氮化硼固体为6到18,硅化物固体(总金属氧化物+氧化硅)为9到26,其余为水。更优选的配比:氮化硼固体为9到15,硅化物固体为13到24,其余为水。最优选的重量百分配比:氮化硼固体为10.5到13.5,硅化物固体为17到20,其余为水。将水溶液涂到物体上之后,应使其干燥到基本上除去所有的水份,优选地,涂层中的水份降到水溶液含水量的百分之10或更低,更优地,降到百分之5或更低。为确保除去水份,有涂层的物体应被加热到212°F以上并保温一段时间,使涂层中的水份降到5%或更低。一般说来,保温干燥时间1到10小时应已足够,优选时间为4到8小时。由于低于212°F时,水溶液中的水不能有效地蒸发,所以,加热有涂层物件的优选温度应为212°F以上。当密封层快速加热到熔锌温度时,约470℃会过量的残余水份会使之产物龟裂。
本发明所用的硅酸盐的分子式为:
                M2O·xSiO2·yH2O式中的M是碱金属,
x是SiO2的摩尔数,范围为1.6到4,
y是H2O的摩尔数,数值至少为1。优选的M应是选自钠、钾和锂的一种元素。
合适的硅酸盐溶液的重量百分配比为:SiO2 26.5,Na2O为10.6,余额为水;K2O 20.8,SiO2 8.3,余额为水;SiO2 28.7,Na2O8.9,余额为水。本发明也使用两种不同的M2O成分,例如Na2O和K2O的混合物。
密封剂一旦沉积在基体并被基本上除去水份之后,它应含有15~70Wt%的氮化硼和30~85wt%的硅酸盐,优选为31~56wt%的氮化硼和44~69wt%的硅酸盐,最优为41.5~47.5wt%的氮化硼和52.5~58.5wt%的硅酸盐。当机件与熔融锌等熔融金属接触时,氧化物和浮渣通常都在表面附着并积累,本发明的氮化硼-硅酸盐密封剂可阻止这种积累。密封剂中,氮化硼的量应使其足以获得不粘的表面,硅酸盐则是用于使氮化硼保持在辊等机件的表面,因而密封了辊,使之免于爱到熔融锌等熔融金属的渗入。为了加强密封剂对辊等机件表面微孔的渗透力,可添加各种硬脂酸盐、磷酸盐或普通的家用洗涤剂等适当的润湿剂,优选量通常约为≤2wt%。氮化硼原料可用高纯的,也可用混有粘土、铝土二氧化硅和碳的。所以,本发明可使用多种价廉的氮化硼商品。准备用于熔融锌中的辊,通常都已涂着诸如碳化钨钴、氧化铝、氧化锆或硼化钼等保护层。本发明的密封剂可涂覆在原有涂层上面,以防熔融锌对辊基质的渗透,并且大大降低熔融锌中的氧化物和/或浮渣在涂膜辊表面和积累。
                    实例1
某个热浸涂55%Al-Zn膜钢条生产线,仅运行4到5天,就发现熔池内的辊因粘着氧化物和/或浮渣而失效。这种失效是指由于涂膜辊表面的粘着物,使得钢板或其它材料与辊接触时产生硌痕和其它损伤。
该生产线熔池内的316L不锈钢锟,原先已用爆燃枪法喷涂了约127和178微米的碳化钨钴涂层,现在应用本发明在原涂层外面再涂两遍含氮化硼的硅酸钠密封剂溶液,所用密封剂的成分为:
40wt%氮化硼“涂料”(BN>30%,粘土<4%,水>66%);
10wt%水;
50wt%硅酸钠溶液(SiO2与Na2O的比值为2.5)。
将涂抹两遍密封剂之后的辊放在稍高于212°F温度下烘烤6小时,然后将这个辊安装在热浸涂锌生产线上,结果成功地运行了18天,而未经再涂膜的辊按预期的仅能耐用4天。从55%Al-Zn熔池中取出辊,发现辊面的3/4上有浮渣积累。将此辊放在稀硫酸(也可用稀盐酸)中,酸洗掉浮渣而不损伤密封层,所以,这个涂膜的辊又可返回熔池中运行。
                      实例2
在某一镀纯锌的成套生产线中,共有3个辊(1个有槽,两个光滑)。用实例1中的方法步骤给这3个辊都涂上密封涂层,经过9天运行后,停工做常规维护检查,发现附着在这些辊上的锌易被除掉,辊又可以返回使用。没有涂层的辊,经过和上述相似的运行后,表面完全被锌覆盖,并且不能揩掉,需用机械方法或酸洗。
不言而喻,可以在不偏离本发明的精神和范围的情况下对本发明优选的实施方案进行修改或改变。

Claims (10)

1.一种密封剂溶液,其组成为6到18重量百分数的氮化硼固体,9到26重量百分数的硅酸盐固体和余额的水。
2.权利要求1的密封剂溶液,其中硅酸盐的化学式为:
            M2O·xSiO2·yH2O式中的M是一种碱金属,
X是SiO2的摩尔数,范围为1.6到4,
y是H2O的摩尔数,数值至少为1。
3.权利要求2的密封剂溶液,其中M从钠、钾和锂选取。
4.一种用氮化硼-硅酸盐密封剂密封物件外表面的方法,该方法包括的步骤为:
(a)制备一种含氮化硼-硅酸盐的水溶液:
(b)将该溶液涂到被密封体的外表面上;
(c)将步骤(b)涂上涂层的物体加热保温一段时间,以基本上除去密封涂层中的水分。
5.权利要求4的方法,其中硅酸盐的化学式为:
               M2O·xSiO2·yH2O式中的M是一种碱金属,
X是SiO2的摩尔数,范围为1.6到4,
y是H2O的摩尔数,数值至少为1。
6.权利要求5的方法,其中M从钠、钾和锂选取。
7.一种具有一层抗熔融金属的多孔性涂层的物件,它的表面有氮化硼-硅酸盐密封剂,密封剂包括15到70重量百分数的氮化硼和30到85重量百分数的硅酸盐。
8.权利要求7的物件,其中所说的物件是钢辊,所说的硅酸盐的化学式为:
                 M2O·xSiO2·yH2O式中的M是碱金属。
X是SiO2的摩尔数,范围为1.6到4,
y是H2O的摩尔数,数值至少为1。
9.权利要求7的物件,其中所说的多孔性涂层从碳化钨钴、氧化铝、氧化硅和碳中选取,所说的M从钠、钾和锂选取。
10.权利要求9的物物,其中所说的多孔性涂层是碳化钨钴膜,所说的M是钠元素。
CN95105853A 1994-05-26 1995-05-25 用密封剂密封具有多孔性涂层的物体的外表面的方法 Expired - Lifetime CN1071782C (zh)

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Publication number Priority date Publication date Assignee Title
CN100381526C (zh) * 2003-03-27 2008-04-16 信越化学工业株式会社 形成多孔膜的组合物,多孔膜和其制备方法,层间绝缘膜和半导体器件
CN114450429A (zh) * 2019-10-29 2022-05-06 安赛乐米塔尔公司 经涂覆的钢基材

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EP0684323A1 (en) 1995-11-29
CA2150165C (en) 1998-09-01
US5869144A (en) 1999-02-09
CA2150165A1 (en) 1995-11-27
KR950031998A (ko) 1995-12-20
DE69515553D1 (de) 2000-04-20
DE69515553T2 (de) 2000-08-03
JP3009341B2 (ja) 2000-02-14
KR100248788B1 (ko) 2000-03-15
CN1071782C (zh) 2001-09-26
EP0684323B1 (en) 2000-03-15

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