CN106588047B - 一种耐久型铸造用纸质浇道管及其制备方法 - Google Patents
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Abstract
本发明公开了一种耐久型铸造用纸质浇道管及其制备方法，在传统的纸质浇道管内侧涂抹一层耐火表面涂层，从而提高纸质浇道管的耐久性；选用的耐火表面涂层的主要成分为石墨烯、六偏磷酸钠和电熔镁砂细粉，其中六偏磷酸钠的作用为粘合剂；电熔镁砂细粉本身具备非常好的耐火性能，同时在高温加热过程中与原纸质浇道管的氧化铝成分生成铝镁尖晶石结构，进一步提高表面涂层的耐火性能和强度，使表面可耐1600℃以上的高温；加入石墨烯可以增强电熔镁砂细粉与氧化铝的反应效果；本发明的纸质浇道管制备工艺简单，成本低廉，耐久性好，一般可以使用10次以上，使用后只需简单清理，无需经常更换，可以大大提高生产效率。
Description
技术领域
本发明涉及耐火材料技术领域，尤其涉及一种耐久型铸造用纸质浇道管及其制备方法。
背景技术
在当今现有技术中，铸造领域通常广泛使用的浇道管部件是采用陶、瓷等耐火材料所烧制而成。其制造过程为将原材料按一定规格要求制成坯体原料，经混料、陈腐、练泥等工序制成管状生坯，经干燥、煅烧窑炉高温烧制成耐火陶瓷浇道管部件。使用时埋入型砂内成为钢水进入型腔内的通道。其基本功能是保证钢水流动过程中不会造成冲砂、粘砂；钢水冷却后不粘铁、不粘砂。其实质是利用耐火材料的耐火性能将铁水和型砂隔离，以达到上述目的。该技术存在制造过程复杂、能耗高、环境污染大、重量大、易损坏、切割粉尘大、坚硬固体废弃物多，不易除去等缺陷。
中国发明专利申请200910117239.6公开了一种铸造用纸质浇道管及其制备工艺，该纸质浇道采用废纸纸浆作为纤维，在缺氧状态下碳化后耐火度较低，造成产品整体强度不够，其他的相关专利申请也均为一次性使用的纸质浇道管，虽然成本低，但是需要经常更换，耗时、耗工，不利于降低成本和提高生产效率。
发明内容
基于背景技术存在的技术问题，本发明提出了一种耐久型铸造用纸质浇道管及其制备方法。
一种耐久型铸造用纸质浇道管，包括以下重量百分比的成分：
废纸浆 70-80%
刚玉粉 5-8%
铝矾土粉 6-12%
粘土 2-5%
水玻璃 1-3%
石墨烯 0.02-0.05%
六偏磷酸钠 0.5-1%
电熔镁砂细粉 余量。
优选的，所述的铝矾土中的氧化铝含量＞85%。
优选的，所述的电熔镁砂细粉的粒径为325目。
一种耐久型铸造用纸质浇道管的制备方法，包括以下步骤：
A、将废纸和水制成废纸浆，并调节浓度为3-5%；
B、按照比例将刚玉粉、铝矾土粉、粘土、水玻璃和一半重量的六偏磷酸钠混合后，搅拌均匀；
C、将调好的浆放入成型机中，成圆筒状；并将圆筒状的纸浆毛坯放入整形模具，热压整形；
D、石墨烯、电熔镁砂细粉和剩余的六偏磷酸钠混合均匀后干法研磨，过250目筛，得到耐火表面涂层；
E、在整形后的纸浆脱模后内侧均匀涂抹步骤D的耐火表面涂层；
F、1200-1300℃高温烘干，即可。
优选的，所述的步骤E中，所述的耐火表面涂层的厚度不低于2mm。
本方案相比于传统方案的有益之处在于：
1、本发明在传统的纸质浇道管内侧涂抹一层耐火表面涂层，从而提高纸质浇道管的耐久性；
2、选用的耐火表面涂层的主要成分为石墨烯、六偏磷酸钠和电熔镁砂细粉，其中六偏磷酸钠的作用为粘合剂，即增加耐火表面涂层与原纸质浇道管的粘结效果，将六偏磷酸钠分成两份分别加入耐火表面涂层与原纸质浇道管，效果更好；电熔镁砂细粉本身具备非常好的耐火性能，同时在高温加热过程中与原纸质浇道管的氧化铝成分生成铝镁尖晶石结构，进一步提高表面涂层的耐火性能和强度，使表面可耐1600℃以上的高温；加入石墨烯并将其与电熔镁砂细粉共磨是为了增加电熔镁砂细粉的分散效果，从而增强电熔镁砂细粉与氧化铝的反应效果。
3、本发明的纸质浇道管制备工艺简单，成本低廉，耐久性好，一般可以使用10次以上，使用后只需简单清理，无需经常更换，可以大大提高生产效率。
具体实施方式
实施例1：
一种耐久型铸造用纸质浇道管，包括以下重量百分比的成分：
废纸浆 75%
刚玉粉 7%
铝矾土粉 8%
粘土 3%
水玻璃 2%
石墨烯 0.04%
六偏磷酸钠 0.8%
电熔镁砂细粉 余量。
所述的铝矾土中的氧化铝含量＞85%。
所述的电熔镁砂细粉的粒径为325目。
一种耐久型铸造用纸质浇道管的制备方法，包括以下步骤：
A、将废纸和水制成废纸浆，并调节浓度为4%；
B、按照比例将刚玉粉、铝矾土粉、粘土、水玻璃和一半重量的六偏磷酸钠混合后，搅拌均匀；
C、将调好的浆放入成型机中，成圆筒状；并将圆筒状的纸浆毛坯放入整形模具，热压整形；
D、石墨烯、电熔镁砂细粉和剩余的六偏磷酸钠混合均匀后干法研磨，过250目筛，得到耐火表面涂层；
E、在整形后的纸浆脱模后内侧均匀涂抹步骤D的耐火表面涂层；
F、1250℃高温烘干，即可。
所述的步骤E中，所述的耐火表面涂层的厚度为2.2-2.5mm。
实施例2：
一种耐久型铸造用纸质浇道管，包括以下重量百分比的成分：
废纸浆 70%
刚玉粉 8%
铝矾土粉12%
粘土 2%
水玻璃 3%
石墨烯 0.05%
六偏磷酸钠 1%
电熔镁砂细粉 余量。
所述的铝矾土中的氧化铝含量＞85%。
所述的电熔镁砂细粉的粒径为325目。
一种耐久型铸造用纸质浇道管的制备方法，包括以下步骤：
A、将废纸和水制成废纸浆，并调节浓度为5%；
B、按照比例将刚玉粉、铝矾土粉、粘土、水玻璃和一半重量的六偏磷酸钠混合后，搅拌均匀；
C、将调好的浆放入成型机中，成圆筒状；并将圆筒状的纸浆毛坯放入整形模具，热压整形；
D、石墨烯、电熔镁砂细粉和剩余的六偏磷酸钠混合均匀后干法研磨，过250目筛，得到耐火表面涂层；
E、在整形后的纸浆脱模后内侧均匀涂抹步骤D的耐火表面涂层；
F、1200℃高温烘干，即可。
所述的步骤E中，所述的耐火表面涂层的厚度为2.5-2.7mm。
实施例3：
一种耐久型铸造用纸质浇道管，包括以下重量百分比的成分：
废纸浆 80%
刚玉粉 5%
铝矾土粉 6%
粘土 5%
水玻璃 1%
石墨烯 0.02%
六偏磷酸钠 0.5%
电熔镁砂细粉 余量。
所述的铝矾土中的氧化铝含量＞85%。
所述的电熔镁砂细粉的粒径为325目。
一种耐久型铸造用纸质浇道管的制备方法，包括以下步骤：
A、将废纸和水制成废纸浆，并调节浓度为3%；
B、按照比例将刚玉粉、铝矾土粉、粘土、水玻璃和一半重量的六偏磷酸钠混合后，搅拌均匀；
C、将调好的浆放入成型机中，成圆筒状；并将圆筒状的纸浆毛坯放入整形模具，热压整形；
D、石墨烯、电熔镁砂细粉和剩余的六偏磷酸钠混合均匀后干法研磨，过250目筛，得到耐火表面涂层；
E、在整形后的纸浆脱模后内侧均匀涂抹步骤D的耐火表面涂层；
F、1300℃高温烘干，即可。
所述的步骤E中，所述的耐火表面涂层的厚度为2.4-2.8mm。
对比实施例1
将实施例1中的耐火表面涂层去除，其余条件不变。
对比实施例2
将实施例1中的石墨烯去除，其余条件不变。
将实施例1和对比实施例1中的纸质浇道管的耐久性和强度做对比，实施例1的纸质浇道管比对比实施例1中的纸质浇道管使用次数增加10次以上，强度也平均增加了32%；
将实施例1和对比实施例2中的纸质浇道管的耐久性和强度做对比，实施例1的纸质浇道管比对比实施例2中的纸质浇道管使用次数增加4-7次，强度也平均增加了12%；此检测数据只针对上述检测样品。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。
Claims (4)
1.一种耐久型铸造用纸质浇道管的制备方法，其特征在于，包括以下步骤：
A、将废纸和水制成废纸浆，并调节浓度为3-5%；
B、按照比例将刚玉粉、铝矾土粉、粘土、水玻璃和一半重量的六偏磷酸钠混合后，搅拌均匀；
C、将调好的浆放入成型机中，成圆筒状；并将圆筒状的纸浆毛坯放入整形模具，热压整形；
D、石墨烯、电熔镁砂细粉和剩余的六偏磷酸钠混合均匀后干法研磨，过250目筛，得到耐火表面涂层；
E、在整形后的纸浆脱模后内侧均匀涂抹步骤D的耐火表面涂层；
F、1200-1300℃高温烘干，即可；
所述的耐久型铸造用纸质浇道管，包括以下重量百分比的成分：
废纸浆 70-80%
刚玉粉 5-8%
铝矾土粉 6-12%
粘土 2-5%
水玻璃 1-3%
石墨烯 0.02-0.05%
六偏磷酸钠 0.5-1%
电熔镁砂细粉余量。
2.如权利要求1所述的耐久型铸造用纸质浇道管的制备方法，其特征在于，所述的铝矾土中的氧化铝含量＞85%。
3.如权利要求1所述的耐久型铸造用纸质浇道管的制备方法，其特征在于，所述的电熔镁砂细粉的粒径为325目。
4.如权利要求1所述的耐久型铸造用纸质浇道管的制备方法，其特征在于，所述的步骤E中，所述的耐火表面涂层的厚度不低于2mm。
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