Sintered diamond tool and method for manufacturing the same

A diamond sintered body tool (20) that is suitable and adapted to be used for cutting an aluminum alloy, comprising:

• a tool base material (22) including a diamond sintered body;
• and
• a surface layer (21) having a thickness of at least 0.1 nm and less than 1 μm and including at least one material selected from the group of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof formed on a surface of the tool base material (22), wherein
• said diamond sintered body of said tool base material (22) has an inner portion (22b) including a first content of an iron group metal, and a surface portion (22a) extending at least 2 nm and at most 5000 nm in depth from said surface of said diamond sintered body, surrounding said inner portion (22b), and including a second content of said iron group metal, said second content being lower than said first content.

A method of manufacturing a diamond sintered body tool that is suitable and adapted to be used for cutting an aluminum alloy, comprising the steps of:

• preparing a diamond sintered body;
• processing said diamond sintered body to form a diamond sintered body tool;
• and
• forming a surface layer having a thickness of at least 0.1 nm and less than 1 μm and including at least one material selected from the group of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof on a surface of said diamond sintered body tool.

A method of manufacturing a diamond sintered body tool that is suitable and adapted to be used for cutting an aluminum alloy, comprising the steps of:

• preparing a diamond sintered body including an iron group metal;
• processing said diamond sintered body to form a diamond sintered body tool;
• and
• surface treating said diamond sintered body tool by immersing said diamond sintered body tool in an acid solution to remove at least some of said iron group metal from a surface portion of said diamond sintered body extending at least 2 nm and at most 5000 nm in depth from a surface of said diamond sintered body and thereby to make a content of said iron group metal lower in said surface portion than in an inner portion of said diamond sintered body.

A method of manufacturing a diamond sintered body tool that is suitable and adapted to be used for cutting an aluminum alloy comprising the steps of:

• preparing a diamond sintered body including an iron group metal;
• processing said diamond sintered body to form a diamond sintered body tool;
• immersing said diamond sintered body tool in an acid solution to remove at least some of the iron group metal from a surface portion of said diamond sintered body extending at least 2 nm and at most 5000 nm in depth from a surface of said diamond sintered body and thereby to make a content of said iron group metal lower in said surface portion than in an inner portion of said diamond sintered body;
• and
• forming a surface layer having a thickness of at least 0.1 nm and less than 1 μm and including at least one material selected from the group of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof on said surface of the diamond sintered body tool.

A method of manufacturing a diamond sintered body tool that is suitable and adapted to be used for cutting an aluminum alloy, comprising the steps of:

• preparing a diamond sintered body including an iron group metal;
• immersing said diamond sintered body in an acid solution to remove at least some of said iron group metal from a surface portion of said diamond sintered body extending at least 2 nm and at most 5000 nm in depth from a surface of said diamond sintered body and thereby to make a content of said iron group metal lower in said surface portion than in an inner portion of said diamond sintered body;
• after said immersing step, processing said diamond sintered body to obtain a diamond sintered body tool;
• and
• after said processing step, forming a surface layer having a thickness of at least 0.1 μm and less than 1 μm and including at least one material selected from the group of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof on said surface of said diamond sintered body.

A method of manufacturing a diamond sintered body tool that is suitable and adapted to be used for cutting an aluminum alloy, comprising the steps of:

• preparing a diamond sintered body including an iron group metal;
• immersing said diamond sintered body in an acid solution to remove at least some of said iron group metal from a surface portion of said diamond sintered body extending at least 2 nm and at most 5000 nm in depth from a surface of said diamond sintered body and thereby to make a content of said iron group metal lower in said surface portion than in an inner portion of said diamond sintered body;
• after said immersing step, forming a surface layer having a thickness of at least 0.1 nm and less than 1 μm and including at least one material selected from the group of silicon, a silicon oxide, a silicon carbide, a silicon nitride and a solid solution thereof on said surface of said diamond sintered body;
• and
• after said forming step, processing said diamond sintered body to obtain a diamond sintered body tool.