Copper(I) Bromide: An Alternative Emitter for Blue-Colored Flame Pyrotechnics

Area of Science:

• Pyrotechnics and Energetic Materials
• Inorganic Chemistry
• Spectroscopy

Background:

• Traditional blue flame pyrotechnic emitters often face limitations in color purity and stability.
• Copper(I) chloride (CuCl) is a known emitter, but alternatives are sought for improved performance.
• Copper(I) bromide (CuBr) presents a potential alternative for generating intense blue flames.

Purpose of the Study:

• To evaluate copper(I) bromide (CuBr) as a novel emitter for blue flame pyrotechnic compositions.
• To synthesize and characterize copper(II) bromate (Cu(BrO3)2) as a precursor for CuBr generation.
• To optimize pyrotechnic formulations containing CuBr and bromate oxidizers for blue flame generation.

Main Methods:

• Emission spectra of CuBr and CuCl were recorded in a butane torch flame.
• Copper(II) bromate was synthesized and incorporated into pyrotechnic compositions.
• Compositions were optimized, and performance was assessed via spectral analysis, chromaticity, burning rates, luminous intensity, and sensitivity tests.

Main Results:

• CuBr and CuCl emission spectra were successfully recorded and compared.
• Optimized pyrotechnic compositions containing copper and potassium bromates yielded blue flames.
• Comprehensive data on flame characteristics, including spectral output and performance metrics, were obtained and analyzed.

Conclusions:

• Copper(I) bromide (CuBr) is a viable alternative emitter for achieving blue flames in pyrotechnic applications.
• The synthesized copper(II) bromate served effectively as both an oxidizer and a CuBr source.
• Optimized compositions demonstrated promising spectral and performance properties for blue pyrotechnic flames.