退火工艺对Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2陶瓷性能与结构的影响
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摘要
针对MoSi_2陶瓷材料室温韧性较差,高温强度低等缺点,通过Mg、Al合金化协同增韧MoSi_2,采用热压烧结技术制备Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2陶瓷,并通过退火处理工艺对MoSi_2复合陶瓷进行处理。着重研究了退火温度(1 300、1 400、1 500和1 600℃)、退火时间(3、6、9和12 h)对Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2复合陶瓷物相组成、显微结构、致密度以及力学性能的影响。结果表明:退火温度对Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2陶瓷的致密度和硬度影响较大,退火温度为1600℃时,陶瓷试样的致密度达到了98. 23%,此时硬度和断裂韧性最大。退火时间对Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2陶瓷的结构与性能也产生一定影响,随着退火时间的延长,试样的致密度、硬度和断裂韧性都有不同程度的增加,当退火时间为12 h时,致密度达到了98. 71%;当退火时间为9 h时,陶瓷试样的力学性能最佳。
In order to overcome the disadvantages of poor cold toughness and low hot strength of MoSi_2 ceramic materials,Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics were prepared by hot pressing sintering through the synergistic toughening of MoSi_2 by Mg and Al alloying. The MoSi_2 composite ceramics were post-treated by annealing. The effects of the annealing temperature( 1 300,1 400,1 500 and 1 600 ℃),annealing duration( 3,6,9 and 12 h) on the phase composition,microstructure,density and mechanical properties were studied. The results show that the annealing temperature has great influence on the density and hardness of the Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics; when the annealing temperature is 1 600 ℃,the density of the ceramic specimen reaches 98. 23%,and the hardness and fracture toughness values are the highest; the annealing duration also has some influence on the structure and properties of Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics: with the extension of the annealing duration,the density,hardness and fracture toughness increase to different degrees; when the annealing duration is 12 h the density reaches 98. 71%; when the annealing duration is9 h,the mechanical properties are the best.
In order to overcome the disadvantages of poor cold toughness and low hot strength of MoSi_2 ceramic materials,Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics were prepared by hot pressing sintering through the synergistic toughening of MoSi_2 by Mg and Al alloying. The MoSi_2 composite ceramics were post-treated by annealing. The effects of the annealing temperature( 1 300,1 400,1 500 and 1 600 ℃),annealing duration( 3,6,9 and 12 h) on the phase composition,microstructure,density and mechanical properties were studied. The results show that the annealing temperature has great influence on the density and hardness of the Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics; when the annealing temperature is 1 600 ℃,the density of the ceramic specimen reaches 98. 23%,and the hardness and fracture toughness values are the highest; the annealing duration also has some influence on the structure and properties of Mo[Si_(0.9)(Al_(0.04)Mg_(0.06))]_2 ceramics: with the extension of the annealing duration,the density,hardness and fracture toughness increase to different degrees; when the annealing duration is 12 h the density reaches 98. 71%; when the annealing duration is9 h,the mechanical properties are the best.
引文
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[23]袁磊,于景坤.Mo粉加入量对反应烧结Mo Si2-Si3N4-BN复合材料性能的影响[J].耐火材料,2008,42(6):440-444.
[24]黄文江,周颖,李斯,等.典型Mo Si2发热元件物相与显微结构分析[J].郑州大学学报(工学版),2017,38(6):88-91.
[25]SONG B B,XIE X S,FENG P Z,et al.Fabrication and characterization of(Mo1-xNix)(Si1-xAlx)2(x=0.025,0.05,and 0.1)Alloys[J].International Journal of Applied Ceramic Technology,2016,13(2):359-366.
[2]YAZDANI-RAD R,MIRVAKILI S A,ZAKERI M.Synthesis of(Mo1-x-Crx)Si2nanostructured powders via mechanical alloying and following heat treatment[J].Journal of Alloys and Compounds,2010,489(2):379-383.
[3]PENG X M,XIA C Q,LIU Y Y,et al.Surface molybdenizing on titanium by halide-activated pack cementation[J].Surface and Coatings Technology,2009,203(20-21):3306-3311.
[4]江莞,赵世柯,王刚.二硅化钼材料的研究现状及应用前景[J].无机材料学报,2001,16(4):577-585.
[5]许迪春,徐庭献,袁启明.Mo Si2基复相材料表面特性的研究[J].耐火材料,2001,35(3):138-140.
[6]DASGUPTA T,UMARJI A M.Improved ductility and oxidation resistance in Nb and Al co-substituted Mo Si2[J].Intermetallics,2008,16(6):739-744.
[7]SHARIF A A.Effects of Re-and Al-alloying on mechanical properties and high-temperature oxidation of Mo Si2[J].Journal of Alloys and Compounds,2012,518:22-26.
[8]刘伯威,潘进,樊毅,等.掺碳SiC颗粒对Mo Si2复合材料性能的影响[J].硅酸盐学报,2001,29(3):204-209.
[9]袁浩田,黄文江,周颖,等.自蔓延高温合成WSi2-MoSi2复合粉体的制备、组成与形貌分析[J].耐火材料,2017,51(3):196-199.
[10]郜剑英,蒋明学,王刚,等.原位合成Mo Si2反应烧结SiC-MoSi2复合材料[J].耐火材料,2003,37(5):259-261.
[11]ZHOU Y,ZHANG Z T,JIN X,et al.Fabrication and composition investigation of WSi2/Mo Si2composite powders cbtained by a selfpropagating high-temperature synthesis method[J].Arabian Journal for Science and Engineering,2016,41(7):2583-2587.
[12]YANAGIHARA K,MARAYAMA T,NAGATA K.Effect of third elements on the pesting suppression of Mo-Si-X intermetallics(X=Al,Ta,Ti,Zr and Y)[J].Intermetallics,1996,4(1):S133-S139.
[13]周颖,赵瑞霞,叶国田,等.基于Al合金化的β-Mo(Si,Al)2自蔓延高温合成[J].耐火材料,2014,48(3):184-187.
[14]MARUYAMA T,YANAGIHARA K.High temperature oxidation and pesting of Mo(Si,Al)2[J].Materials Science and Engineering:A,1997,239-240(1):828-841.
[15]金宵.W、Al对Mo Si2材料组成结构与性能的影响[D].郑州:郑州大学,2017.
[16]李建林,江东亮,谭寿洪.一种新的Mo Si2基复合材料显微结构及其对力学性能的影响[J].无机材料学报,2000,15(1):73-78.
[17]冯培忠,刘伟生,王晓虹,等.Mg微合金化对Mo Si2价电子结构及性能的影响[J].材料热处理学报,2011,32(9):157-161.
[18]SHAN A,FANG W,HASHIMOTO H,et al.Effect of Mg addition on the microstructure and mechanical properties of Mo Si2alloys[J].Scripta Materialia,2002,46(9):645-648.
[19]贾丽娜,郭喜平.合金化和热处理对难熔金属硅化物基合金组织和性能影响的研究现状[J].稀有金属材料与工程,2007,36(7):1304-1308.
[20]ZHU G M,WANG X H,SUN Z,et al.Effect of annealing environment on the crack healing and mechanical properties of(Mo0.97Nb0.03)(Si0.97Al0.03)2[J].Journal of Alloys and Compounds,2015,634:109-114.
[21]冯鹏发,党晓明,胡林,等.钼及其化合物的最新用途[J].中国钼业,2015,39(1):46-49.
[22]王刚,赵世柯,江莞.二硅化钼材料低温氧化的研究进展[J].无机材料学报,2001,16(6):1041-1048.
[23]袁磊,于景坤.Mo粉加入量对反应烧结Mo Si2-Si3N4-BN复合材料性能的影响[J].耐火材料,2008,42(6):440-444.
[24]黄文江,周颖,李斯,等.典型Mo Si2发热元件物相与显微结构分析[J].郑州大学学报(工学版),2017,38(6):88-91.
[25]SONG B B,XIE X S,FENG P Z,et al.Fabrication and characterization of(Mo1-xNix)(Si1-xAlx)2(x=0.025,0.05,and 0.1)Alloys[J].International Journal of Applied Ceramic Technology,2016,13(2):359-366.