Influence of N_2 Addition for Diamond Films Synthesized by Combustion Flame Method Using High Purity Acetylene Gas

Takahashi, Mamoru; Sasaki, Yuichi; Saito, Genji; Kamiya, Osamu; Ohyoshi, Tadashi

doi:10.1299/kikaia.76.1748

Cited by 1 publication

(7 citation statements)

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“…In the SEM image in Fig. 3(a) 16) , the synthesized crystallites showed a ball-like morphology. The ball-like structure is a mixture of graphite and diamond crystallites 12), 17) .…”

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

“…In the SEM images in Figs. 3(g) and (h) 16) , the synthesized crystallites could not be easily etched compared with the crystallites in Case 5, and the synthesized crystallites showed an almost ball-like morphology. Furthermore, they showed nonuniform size.…”

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

“…3(c) In the SEM image in Fig. 3(e) 16) , the synthesized crystallites could be easily etched compared with the crystallites in Case 4, and diamond crystallites could still grow. They showed an almost octahedral morphology, and thus were considered good diamond crystallites.…”

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

“…In the SEM image in Fig. 3(b) 16) , the synthesized crystallites showed no ball-like morphology. The crystallites shown here could be etched compared with those in Case 1 (without nitrogen addition).…”

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 98%

“…We considered that the flame combustion conditions become stable with the use of high-purity acetylene gas, and that good diamond films and good adhesion can be achieved by this method. Thus, diamond synthesis was conducted by stable flame combustion using a mixture of high-purity acetylene and oxygen gas 16) . Nitrogen gas, as a diamond promotion agent, was added to the high-purity…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nitrogen Addition on Delamination of Synthesized Diamond Films by Flame Combustion Method Using High-Purity Acetylene

Takahashi

Sasaki²,

Saito³

et al. 2011

Journal of High Temperature Society

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Diamond films have been synthesized by flame combustion using a mixture of commercial acetylene and oxygen gas, but the flame combustion conditions were unstable, owing to the use of commercial acetylene. This is due to the variable purity of commercial acetylene that includes dissolved impurities. Therefore, in this study, high-purity acetylene was used to synthesize diamond films; it was obtained through special dissolution of pure acetylene of stable and high purity. To obtain good quality diamond films and to achieve good adhesion, diamond films were synthesized by stable flame combustion using a mixture of highpurity acetylene and oxygen gas with nitrogen gas added as the diamond promotion agent; nitrogen flow rate was carefully varied in the range of 0.333~0.667 cm 3 /s. According to the results, the optimal nitrogen flow rate was 0.500 cm 3 /s, and good quality diamond films were synthesized. The synthesized crystallites also showed almost uniform size and high density. Moreover, as nitrogen flow rate was further increased or decreased from 0.500 cm 3 /s, the diamond quality of the synthesized films was reduced. The delamination of films synthesized with varying the nitrogen flow rates was prevented at a very high probability. In particular, the delamination of the films synthesized at a nitrogen flow rate of 0.500 cm 3 /s was completely prevented. To investigate the effects of nitrogen addition on the synthesized diamond films and film delamination, the nitrogen density of synthesized films was analyzed. The nitrogen density of the films synthesized with nitrogen addition was higher than that of the films synthesized without nitrogen addition. The nitrogen density of the synthesized films was increased by nitrogen addition. Thus, nitrogen addition to high-purity acetylene affects diamond synthesis. Moreover, the crystallite morphology of synthesized diamond films can be changed by varying the nitrogen flow rate.

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“…In the SEM image in Fig. 3(a) 16) , the synthesized crystallites showed a ball-like morphology. The ball-like structure is a mixture of graphite and diamond crystallites 12), 17) .…”

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 97%

Section: Effects Of Nitrogen Flow Rate On Delaminationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations