1. converting or being converted into carbon or charcoal, typically by heating or burning
Usage: present participle of carbonise (British spelling); American spelling is carbonizing
2. impregnating or coating with carbon or a carbon compound
Usage: technical/industrial usage

Examples

• The intense heat was carbonising the wood into ash.
• Carbonising the steel surface improves its hardness.
• The fire was carbonising the organic material rapidly.
• Industrial processes are carbonising waste products for reuse.
• The charcoal was formed by carbonising timber in a low-oxygen environment.