ZTA颗粒增强高铬铸铁基复合材料界面研究
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摘要
以自制Fe-Ti金属粘结剂和ZTA(氧化锆增韧氧化铝)陶瓷颗粒为原料,采用粉末冶金工艺制备多孔陶瓷预制体,并浇注高铬铸铁制备ZTA颗粒增强高铬铸铁基复合材料。使用OM、SEM、XRD等分析手段研究预制体和复合材料的复合界面行为。结果表明,Ti含量15%的粘结剂/ZTA复合界面结合优于Ti含量10%的粘结剂/ZTA复合界面。烧结过程中Ti、O、Zr元素扩散到复合界面微区反应形成致密、连续的Ti O_x过渡层,实现ZTA活化包覆。粘结剂与ZTA结合机制为机械结合与反应冶金结合。Ti含量15%的粘结剂制备的预制体具有一定强度和抗热冲击性能,在高铬铸铁液铸渗情况下能保持结构和尺寸,基体与ZTA结合界面致密,无空隙、孔洞缺陷,Ti O_x过渡层分布于界面处起到活化、改善界面结合的作用。
Porous network ceramic prefabrications were prepared by sintering the mixture of self-made Fe-Ti metallic binder and ZTA(ZrO_2toughened Al_2O_3)ceramic particles.High chromium cast iron composites reinforced with ZTA ceramic particles were then prepared by cast-penetrating the ceramic prefabrications with liquid melt.Interfacial bonding behavior of ceramic prefabrications and iron matrix was investigated by OM(optical microscope),SEM(scanning electron microscopy)and XRD(X-ray diffraction).The results show that the interfacial bonding of binder/ZTA with 15%Ti is stronger than that of binder/ZTA with 10%Ti.A consecutive transitional TiO_xlayer is coated on the ZTA particles connecting the ceramic and metal matrix.The inter-diffusion of Ti,O and Zr at the interface leads to the formation of the TiO_xlayer during sintering.Interfacial bonding mechanism of binder and ZTA includes mechanical bonding and metallurgical bonding.Prefabrications made of binder with 15%Ti could maintain their original structure and size under the cast-penetrated condition by the high chromium cast iron liquid.The composites have certain strength and thermal shock resistance.The interface of high chromium cast iron and ZTA is found compact,without cracks or voids.The Ti O_xtransitional layer in the interface helps to activate and improve the interfacial bonding.
Porous network ceramic prefabrications were prepared by sintering the mixture of self-made Fe-Ti metallic binder and ZTA(ZrO_2toughened Al_2O_3)ceramic particles.High chromium cast iron composites reinforced with ZTA ceramic particles were then prepared by cast-penetrating the ceramic prefabrications with liquid melt.Interfacial bonding behavior of ceramic prefabrications and iron matrix was investigated by OM(optical microscope),SEM(scanning electron microscopy)and XRD(X-ray diffraction).The results show that the interfacial bonding of binder/ZTA with 15%Ti is stronger than that of binder/ZTA with 10%Ti.A consecutive transitional TiO_xlayer is coated on the ZTA particles connecting the ceramic and metal matrix.The inter-diffusion of Ti,O and Zr at the interface leads to the formation of the TiO_xlayer during sintering.Interfacial bonding mechanism of binder and ZTA includes mechanical bonding and metallurgical bonding.Prefabrications made of binder with 15%Ti could maintain their original structure and size under the cast-penetrated condition by the high chromium cast iron liquid.The composites have certain strength and thermal shock resistance.The interface of high chromium cast iron and ZTA is found compact,without cracks or voids.The Ti O_xtransitional layer in the interface helps to activate and improve the interfacial bonding.
引文
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[4]Magotteaux International S.A.Cast parts with enhanced wear resistance[P].US7935431B2.2011-05-13.
[5]赵散梅,张新明,郑开宏,等.ZTA/高铬铸铁基复合材料的制备及磨损性能研究[J].铸造技术,2011,32(12):1673-1676.
[6]郑开宏,王娟,徐静,等.陶瓷颗粒对高铬铸铁基复合材料的组织与耐磨性能的影响[C]//第17届全国复合材料学术会议(陶瓷基、C/C及金属基复合材料分论坛).北京,2012:979-984.
[7]贺毅强.颗粒增强金属基复合材料的研究进展[J].热加工工艺,2012,41(2):133-136.
[8]韩丽,高伟超,康永.陶瓷/金属扩散焊连接技术的研究现状及应用[J].陶瓷,2017(4):14-19.
[9]赵散梅.陶瓷颗粒增强高铬铸铁基表层复合材料的制备与磨损性能研究[D].长沙:中南大学,2012.
[10]王申,李淑华,谭惠民.陶瓷-金属的连接技术[J].飞航导弹,2002(6):55-58.
[11]Bank.Interfacial reaction between alumina and Cu-Ti filler metal during reaction metal brazing[J].Weld J,1994,73(3):54-57.
[12]王洪潇.氧化铝陶瓷与金属活性封接技术研究[D].大连:大连交通大学,2006.
[13]田倩.交变电场辅助Al2O3陶瓷/Ti扩散连接工艺与优化[D].哈尔滨:哈尔滨工业大学,2014.
[14]李邦盛,蒋海燕,李志强,等.钛合金熔模精铸氧化锆陶瓷型壳/金属界面反应研究[J].航空材料学报,1999(2):45-49.
[15]张春光,乔冠军,金志浩.Ni-Ti活性钎焊高纯Al2O3界面反应微观机理[J].稀有金属材料与工程,2002(5):371-374.
[16]李礼.二氧化钛表面包覆氧化铝的形态和机理分析[J].无机盐工业,2013,45(8):27-29.