Microstructural effects on the hardness, elastic modulus and fracture toughness of CVD diamond

Book · Wed Dec 30 23:00:00 EST 1998

OSTI ID:305563

Kant, A; Drory, M D; MoberlyChan, W J; Ager, III, J W; Ritchie, R O ^[1]; Moody, N R ^[2]

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1. Lawrence Berkeley National Lab., CA (United States). Materials Sciences Div.
2. Sandia National Labs., Livermore, CA (United States)

The hardness, elastic modulus, and fracture toughness of chemical vapor deposited (CVD) polycrystalline diamond have been investigated on several thick ({approximately}100 {micro}m) free-standing films with regard to the grain size, impurity content and failure mechanisms. Micro-hardness measurements using Vickers indentation, in conjunction with Young`s modulus measurement techniques such as nano-indentation, were employed to estimate the indentation fracture toughness. The toughness of CVD diamond was increased through the addition of non-diamond carbon, which promoted intergranular fracture and enhanced the toughness by grain bridging.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 305563
• Report Number(s): CONF-971201--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL VAPOR DEPOSITION
DIAMONDS
ELASTICITY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HARDNESS
MICROSTRUCTURE
THIN FILMS