Electrochemical machining of carbides and borides

Thesis/Dissertation · Sat Jul 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/1014063· OSTI ID:1014063

Dissaux, Bernard Antoine ^[1]; Muller, Rolf H. ^[2]; Tobias, Charles W. ^[2]

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1. Univ. of California, Berkeley, CA (United States)
2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The use of high rate anodic dissolution (electrochemical machining) for shaping titanium carbide, zirconium carbide, titanium boride and zirconium boride has been investigated in 2N potassium nitrate and 3N sodium chloride under current densities ranging from 20 to 120 A/cm² (corresponding to cutting rates of 0.3 to 1.8 mm/min). The dissolution stoichiometry for all these materials is independent of the current density in the range 20 to 120 A/cm². Both titanium and zirconium appear to dissolve in the +4 state, boron in the +3 state and the weight loss measurements indicate that carbon is oxidized to CO and CO₂. The current voltage curves permit to establish that, over the entire current density and flow range investigated, dissolution occurs in the transpassive state. The surface roughness obtained on TiC and ZrC is within 3-5 μm and is independent of current density, applied voltage or flow rate.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1014063
• Report Number(s): LBL--8023
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BORIDES
BORON
CARBIDES
CARBON
CURRENT DENSITY
DISSOLUTION
ELECTRIC CONDUCTIVITY
ELECTROCHEMICAL MACHINING
FLOW RATE
MACHINING
POTASSIUM NITRATES
ROUGHNESS
SODIUM CHLORIDES
STOICHIOMETRY
TITANIUM
TITANIUM BORIDES
TITANIUM CARBIDES
ZIRCONIUM
ZIRCONIUM BORIDES
ZIRCONIUM CARBIDES