Effect of acetylene gas impurities on atomic signal of metals in atomic absorption and flame spectrophotometry.

A flame combustion method enables the synthesis of diamond using acetylene-oxygen in ambient atmosphere. It has various advantages over other methods, such as in terms of speed, safety and cost. Tungsten carbide (WC) is used as cutting tools in the machining industry. In this study, to obtain nanocrystalline diamond films and to achieve good adhesion on the WC substrate, diamond films were synthesized by flame combustion using a mixture of high-purity acetylene and oxygen gas with the addition of nitrogen gas. Nitrogen gas added as the nanocrystalline diamond promotion agent; nitrogen flow rate was varied. The results indicated that, at the mixture of high-purity acetylene and oxygen gas, the diamond nanocrystallites was not synthesized on the diamond microcrystallites at nitrogen flow rate 0.000 cm3/s. As nitrogen flow rate was increased, the diamond nanocrystallites was synthesized on the microcrystallites. The diamond nanocrystallites was synthesized with high density all over the diamond microcrystallites.

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“…% Co binder. The treatment periods was 10 sec [1,11]. We confirmed that Co was removed from the WC substrate in the acid solution.…”

Section: Pretreatment Of the Wc Substratesupporting

confidence: 53%

Effect of Nitrogen Addition on Synthesis of Nanocrystalline Diamond Films on Tungsten Carbide Substrate by Flame Combustion Method Using High-Purity Acetylene

Takahashi

Kamiya

2015

AMR

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“…Here, Commercial acetylene is the variable purity (91.5~98.5%) as a result of dissolved impurities. High-purity acetylene was obtained through special dissolution of pure acetylene of stable and high purity (more than 99.5%) 9 . And, the amount of nitrogen in high-purity acetylene was investigated and found to be 0.01~0.17%, which was negligible.…”

Section: Effects Of Nitrogen Addition On the Properties Of Synthesizementioning

confidence: 99%

“…And, the amount of nitrogen in high-purity acetylene was investigated and found to be 0.01~0.17%, which was negligible. However, the amount of nitrogen in commercial acetylene is 0.8~2.5% 9 . From results, the diamond morphology and density of the synthesized diamond films was changed by varying the nitrogen flow rate.…”

Section: Effects Of Nitrogen Addition On the Properties Of Synthesizementioning

confidence: 99%

Synthesis of Nanocrystalline Diamond Films on Molybdenum Substrate by Flame Combustion Method

Takahashi

Sugawara

Kamiya

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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The flame combustion method enables the synthesis of diamond using acetylene-oxygen gas flame combustion in ambient atmosphere. It has various advantages over other methods. In this study, to obtain nanocrystalline diamond films and to achieve good adhesion, diamond films were synthesized by flame combustion using a mixture of commercial or high purity acetylene and oxygen gas with the addition of nitrogen gas. Nitrogen gas added as the nanocrystalline diamond promotion agent; nitrogen flow rate was varied. According to the results, at the mixture of commercial acetylene and oxygen gas, as nitrogen flow rate was increased, the diamond nanocrystallites was high density on the microcrystallites. At the mixture of high purity acetylene and oxygen gas, the optimal nitrogen flow rate was 0.500 cm 3 /s, and the diamond nanocrystallites was synthesized continuously on the diamond microcrystallites. They sowed very high density.

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“…However, the amount of nitrogen in commercial acetylene is 0.8~2.5% 15) . From results, the diamond quality of the synthesized diamond films was changed by varying the nitrogen flow rate.…”

Section: Effects Of Nitrogen Addition On the Properties Of Synthesizementioning

confidence: 99%

“…Therefore, in this study, high-purity acetylene was used; it was obtained through special dissolution of pure acetylene of stable and high purity (more than 99.5%) 15) . Generally, high-purity acetylene is used for atomic absorption spectrometry.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of acetylene gas impurities on atomic signal of metals in atomic absorption and flame spectrophotometry.

Cited by 5 publications

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Effect of Nitrogen Addition on Synthesis of Nanocrystalline Diamond Films on Tungsten Carbide Substrate by Flame Combustion Method Using High-Purity Acetylene

Effect of Nitrogen Addition on Synthesis of Nanocrystalline Diamond Films on Tungsten Carbide Substrate by Flame Combustion Method Using High-Purity Acetylene

Synthesis of Nanocrystalline Diamond Films on Molybdenum Substrate by Flame Combustion Method

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

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