在非均相沉淀法制备的Fe-Mo包覆Si3N4陶瓷粉末中添加助剂MgO-Y2O3进行常压烧结,采用X线衍射仪(XRD)、电镜扫描(SEM)等方法研究了不同温度下Mo元素对该Si3N4陶瓷相组成、显微结构和力学性能等方面的影响.结果表明:Mo元素与Fe及Si3N4反应生成Fe3Mo3N化合物,温度升高其分解为金属Fe相与MoSi2,同时组织中出现大量液相促使晶型发生转变并实现液相烧结.该材料在1 650℃时维氏硬度(1 507)为最高,在1 700℃时密度(3.821 3 g/cm3)抗弯强度(908.2 MPa)、断裂韧性(12.08 MPa·m1/2)为最高,当烧结温度为1 750℃时,金属Fe相仍得以保留,生成了极大颗粒MoSi2,材料微观结构恶化,密度、性能迅速下降,所以最佳烧结温度控制在1 700℃左右.
参考文献
| [1] | Zhu Xinwen;Zhou You;Hirao Kiyoshi .Effects of processing method and additive composition on microstructure and thermal conductivity of Si3N4 eermets[J].Journal of the European Cermet Society,2006,26(4-5):711-718. |
| [2] | Lei B;Babushkin O;Warren R .Nitridation study of reaction-bonded silicon nitride in situ by high temperature X-ray diffraction[J].Journal of European Cermet Society,1997,17(09):1113-1118. |
| [3] | Lee Joosin;Mun Jihun;Han Byungdong .Effect of β-Si3N4 seed particles on the property of sintered reaction-bonded silicon nitride[J].Cermets International,2003,29:897-905. |
| [4] | Lee BT.;Yoo JH.;Kim HD. .Size effect of raw Si powder on micro structures and mechanical properties of RBSN and GPSed-RBSN bodies[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):306-313. |
| [5] | Byong-Taek Lee;Hai-Doo Kim .Effect of sintering additives on the nitridation behavior of reaction-bonded silicon nitride[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):126-131. |
| [6] | Woetting G.;Gugel E.;Westerheide R.;Gaspers B. .High-temperature properties of SiC-Si3N4 particle composites[J].Journal of engineering for gas turbines and power: Transactions of the ASME,2000(1):8-12. |
| [7] | Masashi Wada;Kazumi Kashiwagi;Satoshi Kitaoka;Yoshio Fuwa.Tribological Characteristics of Carbon Nano-Fiber Dispersed Silicon Nitride Based Composites in High-Temperature Fuel[J].Key engineering materials,2009:239-240. |
| [8] | Tatami J;Chen I W;Yamamoto Y et al.Fracture resistance and contact damage of TiN particl reinforced Si3N4 cermets[J].Journal of the Cermet Society of Japan,2006,114(1335):1049-1053. |
| [9] | J.B.Zang;W.Han;M.Z.Wang .Zirconia-toughened Si_3N_4 Bonding Polycrystalline Cubic Boron Nitride (PCBN)[J].Key engineering materials,2001(257/258):177-180. |
| [10] | 银锐明,范景莲,钟定铭,刘勋,张曙光.Fe2（Mo04）3/Si3N4复合粉末还原及热压微观组织结构分析[J].中南大学学报（自然科学版）,2011(04):909-914. |
| [11] | 银锐明,范景莲,刘勋,张曙光.添加Mg、Y氧化物对Fe-Mo/Si3N4金属陶瓷微观组织与性能的影响[J].材料研究学报,2010(03):232-238. |
| [12] | 王秋红,郑勇,孙帆,高小龙.碳化硅晶须的制备及其在复合材料增韧中的应用[J].硬质合金,2010(01):49-54. |
| [13] | 罗成,彭卫珍,周书助,谭锦颢,温乾.非均相沉淀法制备包覆粉的研究现状[J].硬质合金,2010(03):180-185. |
| [14] | Zhiquan Guo;Magdalena Parlinska-Wojtan;Gurdial Blugan .The influence of the grain boundary phase on the mechanical properties of Si_3N_4-MoSi_2 composites[J].Acta materialia,2007(8):2875-2884. |
| [15] | Becher, PF;Painter, GS;Lance, MJ;Ii, S;Ikuhara, Y .Direct observations of debonding of reinforcing grains in silicon nitride ceramics sintered with yttria plus alumina additives[J].Journal of the American Ceramic Society,2005(5):1222-1226. |
| [16] | Zhu X W;Zhou Y;Hirao K .Efect of processing method and addtive composition on microstructure and thermal conductivity of Si3N4 cermets[J].Journal of the European Cermet Society,2006,26(4-5):711-715. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%