采用热压烧结法在1950℃/50 MPa/1 h工艺条件下分别对二硼化锆(ZrB2)粗粉、高能球磨超细粉及两者均添加 Ni 烧结助剂的4种粉末进行烧结。采用阿基米德排水法测定不同烧结体的密度,采用扫描电子显微镜(SEM)及其附带的能谱仪(EDS)研究烧结体形貌及成分。研究结果表明,纯相 ZrB2粗粉的烧结致密化过程为温度和压力作用下的球形颗粒切面接触及烧结颈传质；球磨细化后纯相ZrB2粉体的烧结致密化主要得益于粉体表面积及烧结活性的增大；金属Ni烧结助剂对ZrB2粗粉及细化粉体的烧结致密化均能起到促进作用；对ZrB2粗颗粒而言,Ni 元素主要分布在粗颗粒交界处或残留孔隙内,起到增大 ZrB2颗粒间的接触面积及烧结颈传质速率的作用；对 ZrB2超细粉而言,Ni元素主要分布在ZrB2晶界处,促进了 ZrB2晶粒间的互扩散及微细孔隙的进一步缩小。
Four kinds of zirconium diboride (ZrB2 )powders were sintered at the same technical condition of 1 950 ℃/50 MPa/1 h by hot-pressing.They were coarse monolithic ZrB2 powders,high energy milled powders with and without the sintering additive of metal nickel,respectively.The archimedes method was used to meas-ure the density of the as-sintered ceramic samples.The microstructure observation and element distribution mapping were performed by using scanning electron microscopy (SEM)and energy dispersive spectrometry (EDS),respectively.The results indicated that:the density process can be described as spherical surface con-tact and matter diffusion when the coarse monolithic ZrB2 powders were sintered at the condition of high tem-perature and high press.The density behavior was profited from the augmentation of surface area and sinter ac-tive when the powder was deal with high energy mill.The sintering additive of metal nickel was contributive to the sinter density for both thick ZrB2 powders and milled super-thin powders,but different density action be-tween them.The Ni element was distributed at the boundary of thick granules or rudimental cavity,and it had the operation to augment the contact area of thick ZrB2 grain and accelerate the matter diffuse between the con-tacted ZrB2 granules.Ni element was distributed at the common boundary of ZrB2 grain,and which had the con-tribution for the diffusion between ZrB2 grain and the reduction of superfine cavity.
参考文献
| [1] | 刘国玺,郭在在,燕东明,牟晓明,常永威,傅宇东.二硼化锆超高温陶瓷的研究进展[J].兵器材料科学与工程,2012(01):102-106. |
| [2] | 冯伦,王海龙,范冰冰,陈建宝,许红亮,陈德良,卢红霞,张锐.二硼化锆陶瓷增韧技术的研究进展[J].硅酸盐通报,2011(04):834-839. |
| [3] | Levine S R;Opila E J;Halbig M C et al.Evaluation of ultra-high temperature ceramics for aeropropulsion use[J].Journal of the European Ceramic Society,2002,22(14):15):2757-15):2767. |
| [4] | Zamora V;S?nchez-Gonz?lez E;Ortiz A L et al.Hertzi-an Indentation of a ZrB2-30% SiC ultra-high-temperature ceramic up to 800 ℃ in air[J].Journal of the American Ceramic Society,2010,93(07):1848-1851. |
| [5] | Adam L. Chamberlain;William G. Fahrenholtz;Gregory E. Hilmas;Donald T. Ellerby .High-Strength Zirconium Diboride-Based Ceramics[J].Journal of the American Ceramic Society,2004(6):1170-1172. |
| [6] | T.K. Roy;C. Subramanian;A.K. Suri .Pressureless sintering of boron carbide[J].CERAMICS INTERNATIONAL,2006(3):227-233. |
| [7] | Makoto Kuwabara;hirofumi Matsuda;Natsuko Kurata .Shift of the curie point of barium titanate ceramics with sintering temperature[J].Journal of the American Ceramic Society,1997(10):2590-2596. |
| [8] | 赵媛,王连军,张国军,陈立东,江莞.SPS快速反应烧结制备ZrB2-SiC复合材料及其过程研究[J].稀有金属材料与工程,2007(z1):819-822. |
| [9] | 王海龙,汪长安,张锐,黄勇,方岱宁.二硼化锆基超高温陶瓷的制备及性能[J].硅酸盐学报,2007(12):1590-1594. |
| [10] | 尉磊,汪长安,黄勇,孙加林,方岱宁.SiCp1/ZrB2超高温陶瓷的制备及性能[J].硅酸盐学报,2008(z1):85-88. |
| [11] | Monteverde F;Bellosi A .Beneficial effects of AlN as sin-tering aid on microstructure and mechanical properties of hot-pressed ZrB2[J].Advanced Engineering Materi-als,2003,5(07):508-512. |
| [12] | 周晓军,张国军,李耀刚,阚艳梅,王佩玲.以聚碳硅烷为先驱体制备ZrB2-SiC-C超高温陶瓷[J].稀有金属材料与工程,2007(z2):5-7. |
| [13] | 杨飞宇,张幸红,韩杰才,杜善义.碳纳米管-ZrB2-SiC陶瓷基复合材料的制备与性能研究[J].无机材料学报,2008(05):950-954. |
| [14] | Alida Bellosi;Frederic Monteverde;Diletta Sciti .Fast Densification of Ultra-High-Temperature Ceramics by Spark Plasma Sintering[J].International journal of applied ceramic technology,2006(1):32-40. |
| [15] | Hai-Long WANG,Chang-An WANG,De-Liang CHEN,Hong-Ling XU,Hong-Xia LU,Rui ZHANG,Lun FENG.Preparation and characterization of ZrB2-SiC ultra-high temperature ceramics by microwave sintering[J].中国高等学校学术文摘·材料科学,2010(03):276-280. |
| [16] | Ipek Akin;Mikinori Hotta;Filiz Cinar Sahin .Microstructure and densification of ZrB_2-SiC composites prepared by spark plasma sintering[J].Journal of the European Ceramic Society,2009(11):2379-2385. |
| [17] | Zhu S;Fahrenholtz WG;Hilmas GE;Zhang SC .Pressureless sintering of zirconium diboride using boron carbide and carbon additions[J].Journal of the American Ceramic Society,2007(11):3660-3663. |
| [18] | William G. Fahrenholtz;Gregory E. Hilmas;Shi C. Zhang .Pressureless Sintering of Zirconium Diboride: Particle Size and Additive Effects[J].Journal of the American Ceramic Society,2008(5):1398-1404. |
| [19] | F. Valenza;M. L. Muolo;A. Passerone;G. Cacciamani;C. Artini .Control of Interfacial Reactivity Between ZrB_2 and Ni-Based Brazing Alloys[J].Journal of Materials Engineering and Performance,2012(5):660-666. |
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