|
|
|
Abstract The rate of growth of silicide coatings on W, Nb and Ta in a fluidizedbed at 700-1050℃ increases with temperature as a simple function. The silicide coatings obtained in the fluidized-bed are similar to those prepared by other methods. However, Mo behaves differently as do its alloys such as Mo-Ti, Mo-Ti-C and Mo-Ti-Zr, etc. At relatively low temperatures, an abnormal peak of silicide growth rate appears, accompanied by a new phase unreported in the Mo-Si phase diagram. It has a hexagonal crystalline structure of C_(40) type, with lattice parameters a=4.580A,c=6.477A, and c/a=1.41. It is a metastable low temperature modification of the normal tetragonal MoSi_2.When treated in vacuum at high temperatures after siliciding, the hexagonal MoSi_2 converts rapidly and irreversibly into the tetragonal form. At abnormal peak temperature, the growth of the silicide coating on Mo-Ti obeys a linear law, and the silicide coating consists mainly of hexagonal MoSi_2. On the contrary, when pure Mo is silicided, the rate of growth obeys a linear law only at the very beginning, but then shifts approximately to a parabolic law. The silicide coating changes correspondingly from hexagonal to tetragonal MoSi_2. Both forms, however, have the same oxidation behavior at high temperatures.
|
|
Received: 25 August 1981
|
Cite this article:
Wu Weitao Wang Weilin Li Tiefan (Institute of Metal Research; Chinese Academy of sciences). The Silicide Coating of Refractory Metals and Their Alloys in a Fluidized-Bed at Relatively Low Temperatures. J Chin Soc Corr Pro, 1981, 1(4): 16-27.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1981/V1/I4/16
|
[1] E.B.Beidler, C.F.Powell, I.E.Campbell, L.Yntema, J.Electrochem, soc Vol.98, No. 21(1951)
[2] 染野檀,青木利昌,日本金属学会志,Vol.21,No.10,579(1957)
[3] 李铁藩,尹万全,吴维(山文),钼抗氧化保护层的研究2． Ni-Si-B-Zr系保护层的研究,全国第一届难熔金属学术会议报告之一 沈阳,(1964)
[4]#12
[5] 李铁藩,吴维(山文),史宝库,钼抗氧化保护层的研究1． Ti-Cr-W-Si系保护层的研究,全国第一届难熔金属学术会议报告之一 沈阳,(1964)
[6] K.Sedlatschek, H.I.Stadler, Planseeberichte fur Pulvermetallugie, Bd. No. 9, 40 (1961)
[7]#12
[8] J.C.Withers and H.M.Childers, Mater.Desig.Engin, Vol.56, No.7, 120(1962)
[9] 吴维(山文)、王卫林、李铁藩,钼抗氧化保护层的研究6． 钼、钼合金及钨、铌、钽的流床硅化,全国第一届难熔金属学术会议报告之一 沈阳,(1964)
[10] A.R.Cox and R.Brown, J.Less-Common Metals, No. 6, 51-69 (1964)
[11] 李铁藩、吴维(山文),钼的抗氧化保护层的研究5． 硅硼系保护层的结构分析,全国第一届难熔金属学术会议报告之一 沈阳,(1964)
[12] #12
[13] F.B.Litton and H.C.Anderson, J. Electrochem, Soc, Vol. 101, No. 6, 287-292 (1954)
[14] 金子秀夫,增本刚,日本金属学会志,Vol.23,26-30(1960)
[15]#12
[16]#12
[17] J.M.Gunderson, W.G.Dreishach, C.A, No.61, 385(1964)
[18]#12
[19] Commitee on Coatings, National Materiadls Advisory Board, Division of Engineering, National Research Couneil. "High-Temperature Oxidation-Resistant Coatings", Washington D.C., 79; 99; 166． (1970) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
