The characterization of surface films formed on molten magnesium and AZ91D alloy in air/1,1,1,2-tetrafluoroethane atmospheres

Graphite powder was used to prevent a molten AZ91D magnesium alloy from oxidation and burning in order to develop a new pollution-free protection method with low cost. The protection method is expected to have good protective effect without decreasing the mechanical properties of the alloy. The protective ability of graphite powder on the alloy was investigated. Experimental results showed that graphite powder could protect AZ91D melt. The protective ability increased with graphite powder amount and decreased with holding time. The microstructure, chemical composition and phase composition of the surface films formed on the molten AZ91D alloy were analyzed using scanning electron microscopy, energy dispersive spectrometer and X-ray diffraction, respectively. The protection mechanism was discussed. The surface films produced by the reactions between graphite powder, AZ91D alloy melt and the ambient atmosphere had two layers. The continuous and compact outer layer, mainly consisting of MgO and C, may be the fundamental reason for the fact that graphite powder could protect AZ91D alloy melt.

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Multipurpose x-ray reflectometer optimized for the characterization of organic surface films on aqueous subphases

Review of Scientific Instruments ◽

10.1063/1.1331329 ◽

2001 ◽

Vol 72 (1) ◽

pp. 184-192 ◽

Cited By ~ 10

Author(s):

P. Krüger ◽

M. Schalke ◽

J. Linderholm ◽

M. Lösche

Keyword(s):

Surface Films ◽

X Ray

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On the Infiltration of Fiber Reinforced AZ91D Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.437 ◽

2007 ◽

Vol 546-549 ◽

pp. 437-438

Author(s):

Hao Feng Zhao ◽

Ling Wang ◽

Sheng Li Guo ◽

Jun Yi Su

Keyword(s):

Carbon Fibers ◽

Pressure Field ◽

Mathematic Model ◽

Az91d Alloy ◽

Fiber Reinforced ◽

Infiltration Pressure ◽

Flow Rate Change ◽

Molten Magnesium ◽

The Relationship ◽

Plasma Techniques

The infiltration pressure field of fiber reinforced AZ91D was studied in this paper. The carbon fiber T300 was selected and covered with rough TiO2 coat by means of plasma techniques. These carbon fibers were combined together and a kind of continuous pre-former with many micro-passes was constructed. When this pre-former went though a infiltration cabin filled with molten magnesium alloys, the melt infiltrated into pre-former through those micro-passes under infiltration pressure. A physical model and related mathematic model were built to relate this process. The relationship among pressure (p), infiltration flow rate change (e) and the location of infiltration flow (r) was molded.

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Characterization of Chemical/Mechanical Properties of Surface Films in Copper CMP

ECS Journal of Solid State Science and Technology ◽

10.1149/2.0091511jss ◽

2015 ◽

Vol 4 (11) ◽

pp. P5043-P5052 ◽

Cited By ~ 1

Author(s):

Francis Bryan ◽

Michael Clark ◽

Gregory Muldowney ◽

Ravichandra Palaparthi

Keyword(s):

Mechanical Properties ◽

Surface Films ◽

Copper Cmp

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