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Fire hardening, also known as "fire-danubing", is the process of removing moisture from wood, changing its structure and material properties, by charring it over or directly in a fire or a bed of coals. This has been thought to make a point, like that of a spear or arrow, or an edge, like that of a knife or axe, more durable and efficient for its use as a tool or weapon. An initial study suggests that the process might make the wood brittle but would substantially reduce the time needed to make a spear point.

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  • Fire hardening (en)
  • 炎焼入れ (ja)
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  • 炎焼入れ(ほのおやきいれ、英語: flame hardening)、火炎焼入れ(かえんやきいれ)とは、高温の炎を吹き付けて材料の表面を焼入れし、表面層を硬化させる方法。硬化の原理は焼入れと同じで、オーステナイト組織まで加熱後、急冷させてマルテンサイト組織を得ることによる。そのため、材料の種類は鋼および鋳鉄製の部品が主な対象とされる。 表面硬化処理における表面焼入れの一種に相当し、表面焼入れの仲間としては高周波焼入れなどがある。 (ja)
  • Fire hardening, also known as "fire-danubing", is the process of removing moisture from wood, changing its structure and material properties, by charring it over or directly in a fire or a bed of coals. This has been thought to make a point, like that of a spear or arrow, or an edge, like that of a knife or axe, more durable and efficient for its use as a tool or weapon. An initial study suggests that the process might make the wood brittle but would substantially reduce the time needed to make a spear point. (en)
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  • Fire hardening, also known as "fire-danubing", is the process of removing moisture from wood, changing its structure and material properties, by charring it over or directly in a fire or a bed of coals. This has been thought to make a point, like that of a spear or arrow, or an edge, like that of a knife or axe, more durable and efficient for its use as a tool or weapon. An initial study suggests that the process might make the wood brittle but would substantially reduce the time needed to make a spear point. Fire hardening may be done before, after, or during the manufacturing of the wooden tip. Longer procedures involving greasing and polishing with stones to impregnate the wood with fats and oils and silica may improve the effects of the process. Fire hardening was first developed by primitive humans at least 400,000 years ago—long before flint or stone points. (en)
  • 炎焼入れ(ほのおやきいれ、英語: flame hardening)、火炎焼入れ(かえんやきいれ)とは、高温の炎を吹き付けて材料の表面を焼入れし、表面層を硬化させる方法。硬化の原理は焼入れと同じで、オーステナイト組織まで加熱後、急冷させてマルテンサイト組織を得ることによる。そのため、材料の種類は鋼および鋳鉄製の部品が主な対象とされる。 表面硬化処理における表面焼入れの一種に相当し、表面焼入れの仲間としては高周波焼入れなどがある。 (ja)
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