CN111138198A - 一种铝碳化硅复合材料的制备方法及其应用 - Google Patents
一种铝碳化硅复合材料的制备方法及其应用 Download PDFInfo
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Abstract
本发明属于材料制备领域,公开了一种铝碳化硅复合材料的制备方法,包括以下步骤:1)将不同粒径的碳化硅颗粒进行混匀,加入粘结剂、分散剂,进行二次混料,制得原料;2)将原料压制成型,制备出碳化硅陶瓷预制体;3)将碳化硅陶瓷预制体进行烧结,形成多孔陶瓷;4)在惰性气体气氛下,将铝合金加热至融化后,通过惰性气体加压的方式压入多孔陶瓷内部成型,得到铝碳化硅复合材料。其中,步骤1)中的不同粒径的碳化硅颗粒的重量百分比为:1μm碳化硅颗粒5~15%、5μm碳化硅颗粒15~20%、15μm碳化硅颗粒20~30%、其余为35μm碳化硅颗粒。所述铝碳化硅复合材料具有适宜热膨胀系数、高弹性模量、高导热率等优良的性能,适用于惯导系统台体结构体。
Description
技术领域
本发明属于材料制备领域,具体涉及一种铝碳化硅复合材料的制备方法及其应用。
背景技术
现代导航系统中,惯性导航系统的作用非常重要。惯导平台系统在实际工作时,不仅处在高能量、宽频带的随机激励条件下,而且工作时受到的高低温变化、振动冲击、加速度过载、航向姿态变化等因素对系统性能均有很大的影响。在这种复杂的工作环境中,要求其相应的结构件要具有抵抗永久变形和长时间保持精度稳定的能力,这就对结构材料提出了严格要求,如高比刚度,良好的力学性能,高微屈服强度,稳定的物理、化学性能,高导热率,低热膨胀系数等。常用的铝合金材料已经不适用于惯导台体结构件,而铝碳化硅复合材料由于具有优秀的比刚度、热导率、膨胀系数,成为惯性仪表及其惯导系统结构件的优选材料,被誉为“第三代惯性仪表材料”,并且铝碳化硅材料其适宜的密度可改善平台系统的振动性能。
因而,开发一种应用于惯导系统台体结构件的铝碳化硅复合材料是非常有必要的。
发明内容
本发明的目的在于克服现有技术的不足,提供一种铝碳化硅复合材料的制备方法及其应用。所述铝碳化硅复合材料可应用于惯导系统台体结构件,使得惯导系统台体结构件性能优良。
本发明所采取的技术方案是:
一种铝碳化硅复合材料的制备方法,其特征在于,包括以下步骤:
1)将不同粒径的碳化硅颗粒进行混匀,加入粘结剂、分散剂,进行二次混料,制得原料;
2)将原料压制成型,制备出碳化硅陶瓷预制体;
3)将碳化硅陶瓷预制体进行烧结,形成多孔陶瓷;
4)在惰性气体气氛下,将铝合金加热至融化后,通过惰性气体加压的方式压入多孔陶瓷内部成型,得到铝碳化硅复合材料。
其中,不同粒径的碳化硅颗粒的重量百分比为:1μm碳化硅颗粒5~15%、5μm碳化硅颗粒15~20%、15μm碳化硅颗粒20~30%、其余为35μm碳化硅颗粒,各粒径碳化硅颗粒的重量百分比和为100%。
步骤1)中,碳化硅颗粒、粘结剂和分散剂的按重量计的比例为(5-50):(0.1-5):(0.1-5)。
作为上述一种铝碳化硅复合材料的制备方法的进一步改进,预制体烧结的方式为:烧结温度为800~1400℃,保温时间为10~15小时,升温速率和降温速率均为52℃/小时。
作为上述一种铝碳化硅复合材料的制备方法的进一步改进,惰性气体加压的方式为:惰性气体为氩气或氮气,压力为20MPa,真空度为300Pa。
作为上述一种铝碳化硅复合材料的制备方法的进一步改进,粘结剂为石蜡或PVA(聚乙烯醇)。
作为上述一种铝碳化硅复合材料的制备方法的进一步改进,分散剂为油酸。
作为上述一种铝碳化硅复合材料的制备方法的进一步改进,铝碳化硅复合材料中铝和碳化硅的体积占比为铝:碳化硅=(25%~55%):(45%~75%)。
一种惯导系统台体,该惯导系统台体由上述铝碳化硅复合材料加工制备得到。加工方式为:采取聚晶金刚石铣刀对铝碳化硅复合材料进行加工,加工至台体尺寸外形,吃刀量为0.2mm,转速为2000rpm,进给速率为100mm/min。
本发明的有益效果是:
本发明提供一种应用于惯导系统台体结构件的铝碳化硅复合材料及其制备方法,该复合材料制备的惯导台体相比与传统铝合金材料制备的惯导台体,比刚度高、比强度高、结构受力变形小;微屈服强度高,能够承受胶结应力、紧固、热错配应力等长期载荷而不发生微小不可逆变形;尺寸稳定性好,在长期存放或交变温度场冲击下不发生体积、尺寸、形状变化;热膨胀系数适宜,与轴承钢、不锈钢相匹配,减少在交变温度场下的热错配应力;另一方面铝碳化硅材料拥有极高的导热率(200W/(m·K)),有利于惯导系统的仪器仪表散热,能有效提高惯导系统的精度稳定。
具体实施方式
以下通过具体实施方式对本发明进行说明:
实施例1
本实施例的一种铝碳化硅复合材料,其制备步骤为:
1)将不同粒径的碳化硅颗粒进行混匀,加入粘结剂、分散剂,进行二次混料,制得原料;
2)将原料放入钢制模具中,采用200吨四柱液压机制备出碳化硅陶瓷预制体;
3)将碳化硅陶瓷预制体进行烧结,形成多孔陶瓷;
4)在惰性气体气氛下,将铝合金加热至融化后,通过惰性气体加压的方式压入多孔陶瓷内部成型,得到铝碳化硅复合材料。
其中,步骤1)中,碳化硅颗粒的重量百分比为:1μm碳化硅颗粒10%、5μm碳化硅颗粒17%、15μm碳化硅颗粒25%、35μm碳化硅颗粒48%;粘结剂为石蜡,石蜡可以很好地实现与陶瓷粉体(瘠性粉料)的均匀混合;分散剂为油酸,油酸可以提高混合后粉体的流动性以及成型后的坯体强度,还有减少石蜡的使用量和增加粉体稳定性的效果。
步骤3)中,预制体烧结的方式为:烧结温度为1400℃,保温时间为12小时,升温速率和降温速率均为52℃/小时。
步骤4)中,惰性气体加压的方式为:惰性气体为氩气,压力为20MPa,真空度为300Pa;制得的铝碳化硅复合材料中,铝的体积占比为30%,碳化硅的体积占比为70%。
实施例2
本实施例的一种铝碳化硅复合材料,其制备步骤为:
1)将不同粒径的碳化硅颗粒进行混匀,加入粘结剂、分散剂,进行二次混料,制得原料;
2)将原料放入钢制模具中,采用200吨四柱液压机制备出碳化硅陶瓷预制体;
3)将碳化硅陶瓷预制体进行烧结,形成多孔陶瓷;
4)在惰性气体气氛下,将铝合金加热至融化后,通过惰性气体加压的方式压入多孔陶瓷内部成型,得到铝碳化硅复合材料。
其中,步骤1)中,碳化硅颗粒的重量百分比为:1μm碳化硅颗粒5%、5μm碳化硅颗粒20%、15μm碳化硅颗粒25%、35μm碳化硅颗粒50%;粘结剂为石蜡;分散剂为油酸。
步骤3)中,预制体烧结的方式为:烧结温度为1400℃,保温时间为15小时,升温速率和降温速率均为52℃/小时。
步骤4)中,惰性气体加压的方式为:惰性气体为氮气,压力为20MPa,真空度为300Pa;制得的铝碳化硅复合材料中,铝的体积占比为40%,碳化硅的体积占比为60%。
对比例1
本对比例与实施例1相比,其区别仅在于,本对比例中不添加粘结剂。
对比例2
本对比例与实施例1相比,其区别仅在于,本对比例中不添加分散剂。
产品效果测试
对实施例1-2和对比例1-2制备的产品,采用排水法测量各产品的密度;采用热机械分析仪测量各产品的膨胀系数;采用差热分析仪和激光法计算各产品的导热率;采用弹性模量测试仪测量各产品的弹性模量。其结果如表1所示。
表1:
由表1可知,实施例1和实施例2制备的产品性能比对比例1-2制备的产品性能更佳,实施例1和实施例2制备的产品密度低于3.0g/cm3,热膨胀系数合适,具有较优良的弹性和导热性,符合作为惯导系统台体结构体的标准。
对于本领域技术人员而言,本发明显然不限于上述示范性实施例的细节。在不背离本发明的精神或基本特征的情况下,本领域技术人员能够以其他的具体形式实现本发明。但应当注意的是,以上实施例的列举是为了让本领域技术人员更加清楚明白本发明所述技术方案,并不对本发明所要求的保护范围构成限制。
Claims (9)
1.一种铝碳化硅复合材料的制备方法,其特征在于,包括以下步骤:
1)将不同粒径的碳化硅颗粒进行混匀,加入粘结剂、分散剂,进行二次混料,制得原料;
2)将原料压制成型,制备出碳化硅陶瓷预制体;
3)将碳化硅陶瓷预制体进行烧结,形成多孔陶瓷;
4)在惰性气体气氛下,将铝合金加热至融化后,通过惰性气体加压的方式压入多孔陶瓷内部成型,得到铝碳化硅复合材料;
其中,步骤1)中不同粒径的碳化硅颗粒的重量百分比为:1μm碳化硅颗粒5~15%、5μm碳化硅颗粒15~20%、15μm碳化硅颗粒20~30%、其余为35μm碳化硅颗粒,各粒径碳化硅颗粒的重量百分比和为100%。
2.根据权利要求1所述的制备方法,其特征在于,步骤3)中预制体烧结的方式为:烧结温度为800~1400℃,保温时间为10~15小时,升温速率和降温速率均为52℃/小时。
3.根据权利要求1所述的制备方法,其特征在于,步骤4)中惰性气体加压的方式为:惰性气体为氩气或氮气,压力为10-20MPa,真空度为300Pa。
4.根据权利要求1所述的制备方法,其特征在于,步骤1)中的碳化硅颗粒、粘结剂和分散剂按重量计的比例为(5-50):(0.1-5):(0.1-5)。
5.根据权利要求1所述的制备方法,其特征在于,粘结剂为石蜡或PVA。
6.根据权利要求1所述的制备方法,其特征在于,分散剂为油酸。
7.根据权利要求1所述的制备方法,其特征在于,铝碳化硅复合材料中铝和碳化硅的体积占比为铝:碳化硅=(25%~55%):(45%~75%)。
8.一种铝碳化硅复合材料,其特征在于,所述铝碳化硅复合材料由权利要求1-7中任一项所述的制备方法制备得到。
9.一种惯导系统台体,其特征在于,所述惯导系统台体由权利要求8所述的铝碳化硅复合材料加工制备得到。
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