CN107311625B - 一种连铸中间包用复合材质整体塞棒塞头材料 - Google Patents

一种连铸中间包用复合材质整体塞棒塞头材料 Download PDF

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CN107311625B
CN107311625B CN201710543012.2A CN201710543012A CN107311625B CN 107311625 B CN107311625 B CN 107311625B CN 201710543012 A CN201710543012 A CN 201710543012A CN 107311625 B CN107311625 B CN 107311625B
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冯作鹏
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Abstract

一种连铸中间包用复合材质整体塞棒塞头材料，属于功能耐火材料领域。其特征在于，重量份组成为：电熔镁砂85份，鳞片石墨6份~10份，三聚磷酸钠2份~4份，硼玻璃2份~3份，硼化钙1份~2份，及添加量为上述组成总重量8%~10%的量的酚醛树脂。本发明塞头材料利用三聚磷酸钠、硼玻璃和硼化钙的复合使用，达到耐侵蚀、抗冲刷，表面不结瘤，控流好，浇钢完毕后关闭时，可关死、不漏钢的效果。

Description

一种连铸中间包用复合材质整体塞棒塞头材料
技术领域
一种连铸中间包用复合材质整体塞棒塞头材料，属于功能耐火材料领域。
背景技术
整体塞棒由于结构的特殊性，一般采用等静压方式成型。整体塞棒安装于连铸中间包内，主要用于中间包开闭，控制中间包至结晶器的钢水流量，浇注完毕后堵流。塞棒还可以根据钢厂要求，通过吹氩孔，向中间包内吹入氩气和其它惰性气体，净化钢水，以及减少中包水口和浸入式水口内壁Al2O3等化合物附着而形成的堵塞。
为适应不同精炼条件以及钢种的连铸需要，整体塞棒塞头主要有Al2O3-C质、MgO-C质、MA-C质等不同塞头材料。连铸生产过程中，经Ca-Si处理钢种和P、S合金化的高速切削钢，整体塞棒塞头受钢水的侵蚀和冲刷，塞头部位侵蚀较快，常因无法控制钢水流速而报废，目前主要使用MgO-C塞头来适应这些特钢使用要求。
MgO-C塞头主要成分为电熔镁砂，而电熔镁砂膨胀系数大（14×10-6℃-1~15×10-6℃-1），热震稳定性差，一般引入大量鳞片石墨来提高热震稳定性，与Al2O3-C塞头、MA-C塞头碳含量相比，MgO-C塞头引入的鳞片石墨高出4份~6份，碳含量普通大于14份。有的生产厂家引入Al2O3、MA、SiC等较低膨胀材料，鳞片石墨加入量控制在6份~10份，热震稳定性有所提高，但这些措施的实施对于塞头抗侵蚀、抗冲刷性效果较差，控流不好。同时抗氧化剂普通采用4份~6份的金属硅，在高温时，金属硅容易与鳞片石墨反应形成部分SiC，对热震稳定性有负面影响。
目前所使用的MgO-C塞头出现的主要问题：1、耐侵蚀、抗冲刷性能差，控流不好，浇钢完毕后，关不死；2、在中间包内烘烤和开浇时，塞头内部容易热震损伤，导致开裂、掉头和掉尖，给连铸生产带来重大隐患；3、塞头表面与钢水成分反应结瘤，形成突起，与之配合的中包水口或整体水口碗部形成间隙，控流不好，浇钢完毕后，关不死。
发明内容
本发明要解决的技术问题是：克服现有技术的不足，提供一种控流效果好的连铸中间包用复合材质整体塞棒塞头材料。
本发明解决其技术问题所采用的技术方案是：该连铸中间包用复合材质整体塞棒塞头材料，其特征在于，组成为：电熔镁砂85份，鳞片石墨6份~10份，三聚磷酸钠2份~4份，硼玻璃2份~3份，硼化钙1份~2份，及添加量为上述组成总重量8%~10%的量的酚醛树脂。
本发明主要实现了减少鳞片石墨加入量，提高塞头耐侵蚀、抗冲刷性，同时不降低其热震稳定性，利用三聚磷酸钠和硼玻璃在高温时形成部分熔融体而增加高温韧性，减小内应力，提高塞头热震稳定性；塞头表面与钢水成分反应时，由于三聚磷酸钠和硼玻璃的存在，会形成低熔点化合物而冲刷掉，不会在塞头表面聚积，表面光滑；同时抗氧化剂由硼化钙代替金属硅，杜绝金属硅对鳞片石墨的消耗。
优选的，组成为：电熔镁砂85份，鳞片石墨7份~8.5份，三聚磷酸钠2.5份~3.2份，硼玻璃2.3份~2.6份，硼化钙1.3份~1.7份，及上述组成总重量的8.5%~9.5%的酚醛树脂。优选的组成能够到到本发明的最佳效果。
优选的，所述电熔镁砂中氧化镁含量在98wt %以上，C/S在2~2.7，粒度小于1mm。本发明优选的电熔镁砂的膨胀系数在其他组份的最佳调控范围内。能够更好地保证材料的热震稳定性。
优选的，所述鳞片石墨中碳含量在98wt %以上，粒度在0.15mm以下。本发明优选的鳞片石墨对电熔镁砂的膨胀系数的调节于本发明最为适应，与三聚磷酸钠和硼玻璃在的协同作用最强，能更好的增加高温韧性，减小内应力，提高塞头热震稳定性。
优选的，所述三聚磷酸钠粒度小于0.1mm。
优选的，所述硼玻璃和硼化钙粒度小于0.045mm。
优选的三聚磷酸钠、硼玻璃和硼化钙的性能对本发明的适应性最好，与鳞片石墨的协同作用最强，能更好的增加高温韧性，减小内应力，提高塞头热震稳定性。
优选的，所述酚醛树脂的分子量为400~500。优选的酚醛树脂以其余物料的总量的百分比加入，起到统一的调节作用，保证表面不结瘤，控流好。
与现有技术相比，本发明的一种连铸中间包用复合材质整体塞棒塞头材料所具有的有益效果是：本发明提供了一种连铸中间包整体塞棒塞头材料，用以连铸Ca-Si处理钢种和P、S合金化的高速切削钢时，达到控流效果好，浇钢完毕后关闭时，可关死、不漏钢的目的。本发明主要实现了减少鳞片石墨加入量，提高塞头耐侵蚀、抗冲刷性，同时不降低其热震稳定性，利用三聚磷酸钠和硼玻璃在高温时形成部分熔融体而增加高温韧性，减小内应力，提高塞头热震稳定性；塞头表面与钢水成分反应时，由于三聚磷酸钠和硼玻璃的存在，会形成低熔点化合物而冲刷掉，不会在塞头表面聚积，表面光滑；同时抗氧化剂由硼化钙代替金属硅，杜绝金属硅对鳞片石墨的消耗。本发明塞头材料利用三聚磷酸钠、硼玻璃和硼化钙的复合使用，达到耐侵蚀、抗冲刷，表面不结瘤，控流好，浇钢完毕后关闭时，可关死、不漏钢的效果。
具体实施方式
下面结合具体实施例对本发明做进一步说明，其中实施例1为最佳实施例。
实施例1
组成为：电熔镁砂85份，鳞片石墨7.8份，三聚磷酸钠2.8份，硼玻璃2.5份，硼化钙1.5份，及添加量为上述组成总重量9%的量的酚醛树脂；
其中，电熔镁砂中氧化镁含量在99.2wt %，C/S在2.4，粒度为0.6mm；鳞片石墨中碳含量在98.8wt %，粒度在0.15mm；三聚磷酸钠粒度小于0.1mm；硼玻璃和硼化钙粒度小于0.045mm；酚醛树脂的分子量为450。
实施例2
组成为：电熔镁砂85份，鳞片石墨7份，三聚磷酸钠3.2份，硼玻璃2.3份，硼化钙1.7份，及添加量为上述组成总重量8.5%的量的酚醛树脂；
其中，电熔镁砂中氧化镁含量在99.1wt %，C/S在2.2，粒度为0.7mm；鳞片石墨中碳含量在98.6wt %，粒度在0.14mm；三聚磷酸钠粒度为0.7mm；硼玻璃和硼化钙粒度为0.045mm；酚醛树脂的分子量为400。
实施例3
组成为：电熔镁砂85份，鳞片石墨8.5份，三聚磷酸钠2.5份，硼玻璃2.6份，硼化钙1.3份，及添加量为上述组成总重量9.5%的量的酚醛树脂；
其中，电熔镁砂中氧化镁含量在98.3wt %以上，C/S在2.5，粒度为0.3mm；鳞片石墨中碳含量在98.3wt %，粒度在0.13mm；三聚磷酸钠粒度为0.6mm；硼玻璃和硼化钙粒度为0.045mm；酚醛树脂的分子量为500。
实施例4
组成为：电熔镁砂85份，鳞片石墨6份，三聚磷酸钠4份，硼玻璃2份，硼化钙2份，及添加量为上述组成总重量8%的量的酚醛树脂；
其中，电熔镁砂中氧化镁含量在97.8wt %，C/S在2.7，粒度1.1mm；鳞片石墨中碳含量在97.9wt %，粒度在0.13mm；三聚磷酸钠粒度为0.1mm；硼玻璃和硼化钙粒度为0.042mm；酚醛树脂的分子量为520。
实施例5
组成为：电熔镁砂85份，鳞片石墨10份，三聚磷酸钠2份，硼玻璃3份，硼化钙1份，及添加量为上述组成总重量10%的量的酚醛树脂；
其中，电熔镁砂中氧化镁含量在98wt %，C/S在2，粒度1mm；鳞片石墨中碳含量在98份，粒度在0.15mm；三聚磷酸钠粒度为0.1mm；硼玻璃和硼化钙粒度为0.045mm；酚醛树脂的分子量为600。
对比例1
组成为：电熔镁砂85份，鳞片石墨7.8份，三聚磷酸钠2.8份，硼玻璃4份，及添加量为上述组成总重量9%的量的酚醛树脂；物料性能同实施例1。
对比例2
组成为：电熔镁砂85份，鳞片石墨7.8份，三聚磷酸钠2.8份，及添加量为上述组成总重量9%的量的酚醛树脂；物料性能同实施例1。
对比例3
组成为：电熔镁砂85份，鳞片石墨7.8份，硼玻璃2.5份，硼化钙1.5份，及添加量为上述组成总重量9%的量的酚醛树脂；物料性能同实施例1。
实施例和对比例所得材料的性能检测见表1。
表1 实施例和对比例所得材料的性能
Figure DEST_PATH_IMAGE002
。
热震稳定性 r值为材料制成的压痕样品在600℃下保温10min后水淬，并测试此时的三点弯曲强度。压痕样品热震后与热震前三点弯曲强度的比值。
耐侵蚀系数为材料制成的样品在水中侵蚀6个月后与侵蚀前的三点弯曲强度的比值。
以上所述，仅是本发明的较佳实施例而已，并非是对本发明作其它形式的限制，任何熟悉本专业的技术人员可能利用上述揭示的技术内容加以变更或改型为等同变化的等效实施例。但是凡是未脱离本发明技术方案内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与改型，仍属于本发明技术方案的保护范围。

Claims (3)

1.一种连铸中间包用复合材质整体塞棒塞头材料，其特征在于，重量份组成为：电熔镁砂85份，鳞片石墨6份~10份，三聚磷酸钠2份~4份，硼玻璃2份~3份，硼化钙1份~2份，及添加量为上述组成总重量8%~10%的量的酚醛树脂；所述电熔镁砂中氧化镁含量在98wt %以上，C/S在2~2.7，粒度小于1mm，鳞片石墨中碳含量在98wt %以上，粒度在0.15mm以下，三聚磷酸钠粒度小于0.1mm，硼玻璃和硼化钙粒度小于0.045mm。
2.根据权利要求1所述的一种连铸中间包用复合材质整体塞棒塞头材料，其特征在于：组成为：电熔镁砂85份，鳞片石墨7份~8.5份，三聚磷酸钠2.5份~3.2份，硼玻璃2.3份~2.6份，硼化钙1.3份~1.7份，及添加量为上述组成总重量8%~10%的量的酚醛树脂。
3.根据权利要求1或2所述的一种连铸中间包用复合材质整体塞棒塞头材料，其特征在于：所述酚醛树脂的分子量为400~500。
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