CN109627009B - 一种SiC陶瓷及其制备方法 - Google Patents
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Abstract
本发明提供一种SiC陶瓷及其制备方法,该SiC陶瓷,按重量份计,由75‑85份SiC和15‑25份烧结助剂热压烧结而成;所述烧结助剂包括10‑16.7份Mg2Si和5‑8.3份Al。本发明通过在SiC中加入烧结助剂Mg2Si、Al制备SiC陶瓷,降低了本发明SiC陶瓷的烧结温度,并提高了其致密度、相对密度和力学性能,其中,本发明SiC陶瓷的烧结温度可低至1350℃,致密度可高达99.3%,体积密度可高达3.03g/cm3,维氏硬度可高达1655MPa,抗弯强度可高达592MPa,弹性模量可高达204GPa。
Description
技术领域
本发明涉及陶瓷技术领域,特别涉及一种SiC陶瓷及其制备方法。
背景技术
SiC陶瓷具有高硬度、耐高温性、耐磨损性和抗热震性等优点,使其在结构工程中得到广泛的应用,特别是其独特的高温力学性能使之特别适宜于制造高温熔炉部件、火箭燃烧室内衬及燃气涡轮机叶片。
SiC由于强共价键(Si-C键)、烧结致密化所需的体积扩散和晶界扩散速度较小,纯SiC烧结陶瓷很难致密,从而限制其应用。目前,一般通过设计烧结助剂体系的组成和控制烧结条件等来实现致密化,但仍然存在烧结温度高,致密化程度低的问题。
发明内容
有鉴于此,本发明旨在提出一种SiC陶瓷及其制备方法,以解决现有SiC陶瓷烧结温度高、致密化程度低的问题。
为达到上述目的,本发明的技术方案是这样实现的:
一种SiC陶瓷,按重量份计,由75-85份SiC和15-25份烧结助剂热压烧结而成;所述烧结助剂包括10-16.7份Mg2Si和5-8.3份Al。
可选地,所述的SiC陶瓷,按重量份计,由75份SiC和25份烧结助剂热压烧结而成;所述烧结助剂包括16.7份Mg2Si和8.3份Al。
可选地,所述SiC的粒径为0.3-0.5μm;所述烧结助剂的粒径为2-5μm。
本发明的另一目的在于提供一种制备上述SiC陶瓷的方法,其包括以下步骤:
1)向所述SiC和所述烧结助剂中加入无水乙醇,球磨,得到粉料A;
2)将所述粉料A烘干并进行筛分处理,得到粉料B;
3)将所述粉料B成型后,热压烧结,即得SiC陶瓷。
可选地,所述步骤1)中所述无水乙醇的用量为所述SiC和所述烧结助剂总量的90%-150%。
可选地,所述步骤1)中所述球磨的球磨时间为1-4h。
可选地,所述步骤2)中所述筛分处理的筛孔尺寸为100目。
可选地,所述步骤3)中所述热压烧结的液相烧结温度为1350-1550℃,烧结压力为30-50MPa,烧结保温时间为3-5min。
相对于现有技术,本发明所述的SiC陶瓷具有以下优势:
1、本发明通过在SiC中加入烧结助剂Mg2Si、Al制备SiC陶瓷,因Mg2Si在高温下有一定程度的分解,产生的Mg与SiC表面的氧化膜反应,可去除SiC表面的氧化膜,进而有利于提高SiC烧结时的扩散速率,且高温熔融的Mg2Si液和Al液可以润湿SiC颗粒,在外加压力作用下能够加快SiC颗粒迁移,使得颗粒重新排列,并在界面张力的作用下将颗粒紧紧拉在一起,增强坯件收缩,从而有利于降低本发明SiC陶瓷的烧结温度,并提高其致密度、相对密度和力学性能,其中,本发明SiC陶瓷的烧结温度可低至1350℃,致密度可高达99.3%,体积密度可高达3.03g/cm3,维氏硬度可高达1655MPa,抗弯强度可高达592MPa,弹性模量可高达204GPa。
2、本发明SiC陶瓷的制备方法简单,热压烧结条件温和,易于工业化应用。
具体实施方式
Mg2Si的熔点为1102℃,其在高温下有一定程度的分解,产生的Mg可与SiC表面的氧化膜反应,进而可去除SiC表面的氧化膜,从而有利于提高SiC烧结时的扩散速率;Al的熔点低(660℃)、沸点高(2500℃),Al在低温时可与SiC反应,生成Al4C3,在高于1600K后,又可被Si还原,生成Al和SiC。Al的加入不会造成SiC的分解,又可与SiC相互作用提高界面结合。本发明基于此,以Mg2Si作为主烧结助剂,以Al作为辅助烧结助剂实现低温条件下高致密化SiC陶瓷的制备。
需要说明的是,在不冲突的情况下,本发明中的实施例及实施例中的特征可以相互组合。
下面将结合实施例来详细说明本发明。
实施例1
一种SiC陶瓷,按重量份计,由75份SiC和25份烧结助剂热压烧结而成;烧结助剂包括16.7份Mg2Si和8.3份Al,其中,SiC的粒径为0.3-0.5μm,烧结助剂的粒径为2-5μm,且作为烧结助剂的Mg2Si和Al的粒径均为2-5μm,各原料在该粒径范围内可减少或避免团聚现象的发生,从而避免其对SiC陶瓷的烧结产生不利影响。
上述SiC陶瓷的制备方法,具体包括以下步骤:
1)将SiC和烧结助剂按上述比例称取并放入球磨罐中,然后,加入用量为SiC和烧结助剂总量的110%的无水乙醇,球磨4h,得到粉料A;
2)用鼓风干燥箱将粉料A烘干并用筛孔尺寸为100目的筛进行筛分处理,得到粉料B(筛下粉料);
3)将粉料B放入石墨模具成型后,热压烧结,其中,热压烧结的液相烧结温度为1350℃,烧结压力为40MPa,烧结保温时间为5min,即得SiC陶瓷。
实施例2
一种SiC陶瓷,按重量份计,由80份SiC和20份烧结助剂热压烧结而成;烧结助剂包括13.3份Mg2Si和6.7份Al,其中,SiC的粒径为0.3-0.5μm,烧结助剂的粒径为2-5μm,且作为烧结助剂的Mg2Si和Al的粒径均为2-5μm,各原料在该粒径范围内可减少或避免团聚现象的发生,从而避免其对SiC陶瓷的烧结产生不利影响。
上述SiC陶瓷的制备方法,具体包括以下步骤:
1)将SiC和烧结助剂按上述比例称取并放入球磨罐中,然后,加入用量为SiC和烧结助剂总量的110%的无水乙醇,球磨4h,得到粉料A;
2)用鼓风干燥箱将粉料A烘干并用筛孔尺寸为100目的筛进行筛分处理,得到粉料B(筛下粉料);
3)将粉料B放入石墨模具成型后,热压烧结,其中,热压烧结的液相烧结温度为1350℃,烧结压力为40MPa,烧结保温时间为5min,即得SiC陶瓷。
实施例3
一种SiC陶瓷,按重量份计,由85份SiC和15份烧结助剂热压烧结而成;烧结助剂包括10份Mg2Si和5份Al,其中,SiC的粒径为0.3-0.5μm,烧结助剂的粒径为2-5μm,且作为烧结助剂的Mg2Si和Al的粒径均为2-5μm,各原料在该粒径范围内可减少或避免团聚现象的发生,从而避免其对SiC陶瓷的烧结产生不利影响。
上述SiC陶瓷的制备方法,具体包括以下步骤:
1)将SiC和烧结助剂按上述比例称取并放入球磨罐中,然后,加入用量为SiC和烧结助剂总量的110%的无水乙醇,球磨4h,得到粉料A;
2)用鼓风干燥箱将粉料A烘干并用筛孔尺寸为100目的筛进行筛分处理,得到粉料B(筛下粉料);
3)将粉料B放入石墨模具成型后,热压烧结,其中,热压烧结的液相烧结温度为1550℃,烧结压力为40MPa,烧结保温时间为5min,即得SiC陶瓷。
对实施例1~实施例3的SiC陶瓷的性能进行测试,测试结果如表1所示。
表1
由表1可知,实施例1~实施例3的SiC陶瓷的体积密度、致密度以及力学性能均较高,说明本发明通过在SiC中添加烧结助剂Mg2Si和Al可以实现低温烧结高致密化SiC陶瓷产品,且所得SiC陶瓷产品足以在较高强度工况下使用。
以上仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (8)
1.一种SiC陶瓷,其特征在于,按重量份计,由75-85份SiC和15-25份烧结助剂热压烧结而成;所述烧结助剂包括10-16.7份Mg2Si和5-8.3份Al;
所述SiC陶瓷通过以下方法制得:
1)向所述SiC和所述烧结助剂中加入无水乙醇,球磨,得到粉料A;
2)将所述粉料A烘干并进行筛分处理,得到粉料B;
3)将所述粉料B成型后,热压烧结,即得SiC陶瓷;所述热压烧结的烧结工艺参数为:液相烧结温度:1350-1550℃,烧结压力:30-50MPa,烧结保温时间:3-5min。
2.根据权利要求1所述的SiC陶瓷,其特征在于,按重量份计,由75份SiC和25份烧结助剂热压烧结而成;所述烧结助剂包括16.7份Mg2Si和8.3份Al。
3.根据权利要求1或2所述的SiC陶瓷,其特征在于,所述SiC的粒径为0.3-0.5μm;所述烧结助剂的粒径为2-5μm。
4.制备权利要求1或2或3所述的SiC陶瓷的方法,其特征在于,包括以下步骤:
1)向所述SiC和所述烧结助剂中加入无水乙醇,球磨,得到粉料A;
2)将所述粉料A烘干并进行筛分处理,得到粉料B;
3)将所述粉料B成型后,热压烧结,即得SiC陶瓷。
5.根据权利要求4所述的SiC陶瓷的制备方法,其特征在于,所述步骤1)中所述无水乙醇的用量为所述SiC和所述烧结助剂总量的90%-150%。
6.根据权利要求4所述的SiC陶瓷的制备方法,其特征在于,所述步骤1)中所述球磨的球磨时间为1-4h。
7.根据权利要求4所述的SiC陶瓷的制备方法,其特征在于,所述步骤2)中所述筛分处理的筛孔尺寸为100目。
8.根据权利要求4所述的SiC陶瓷的制备方法,其特征在于,所述步骤3)中所述热压烧结的液相烧结温度为1350-1550℃,烧结压力为30-50MPa,烧结保温时间为3-5min。
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CN108642316A (zh) * | 2018-05-22 | 2018-10-12 | 新沂市中诺新材料科技有限公司 | 一种Al-Mg/SiC复合材料 |
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