Why graphite is used as solid lubricant
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ᴛʜᴇ ᴄᴀʀʙᴏɴ ᴀᴛᴏᴍs ᴀʀᴇ sᴛʀᴏɴɢʟʏ ʙᴏɴᴅᴇᴅ ᴛᴏɢᴇᴛʜᴇʀ ɪɴ sʜᴇᴇᴛs. ʙᴇᴄᴀᴜsᴇ ᴛʜᴇ ʙᴏɴᴅs ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ sʜᴇᴇᴛs ᴀʀᴇ ᴡᴇᴀᴋ, ɢʀᴀᴘʜɪᴛᴇ sʜᴏᴡs ʟᴏᴡᴇʀ sʜᴇᴀʀɪɴɢ sᴛʀᴇɴɢᴛʜ ᴜɴᴅᴇʀ ғʀɪᴄᴛɪᴏɴ ғᴏʀᴄᴇ. ᴛʜᴜs ɪᴛ ᴄᴀɴ ʙᴇ ᴜsᴇᴅ ᴀs ᴀ sᴏʟɪᴅ ʟᴜʙʀɪᴄᴀɴᴛ ᴀɴᴅ ʜᴀs ʙᴇᴄᴏᴍᴇ ᴏɴᴇ ᴏғ ᴛʀᴀᴅɪᴛɪᴏɴᴀʟ ᴀɴᴅ ᴘʀɪᴍᴀʀʏ sᴏʟɪᴅ ʟᴜʙʀɪᴄᴀᴛɪᴏɴ ᴍᴀᴛᴇʀɪᴀʟs.
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The carbon atoms are strongly bonded together in sheets. Because the bonds between the sheets are weak, graphite shows lower shearing strength under friction force. Thus it can be used as a solid lubricant and has become one of traditional and primary solid lubrication materials...
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