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ทังสเตนคาร์ไบด์

อ่าน 190967 | ตอบ 4006
ทังสเตนคาร์ไบด์
       ทังสเตนคาร์ไบด์ (อังกฤษ: tungsten carbide) มีสูตรเคมีคือ WC ในรูปพื้นฐานจะมีลักษณะเป็นผงสีเทาละเอียด มี 2 โครงสร้างคือแบบหกเหลี่ยม (α-WC) และแบบลูกบาศก์ (β-WC)
 
       ทังสเตนคาร์ไบด์เตรียมได้จากการทำปฏิกิริยาระหว่างทังสเตนกับคาร์บอนที่อุณหภูมิ 1400–2000 °C[3] หรือให้ความร้อนกับทังสเตนไตรออกไซด์และแกรไฟต์โดยตรงที่ 900 °C หรือในแก๊สไฮโดรเจนที่ 670 °C ตามด้วยการคาร์บิวไรเซชันในแก๊สอาร์กอนที่ 1000 °C[4] หรือใช้วิธีการเคลือบด้วยไอเคมี เช่น
  • ทำปฏิกิริยาระหว่างทังสเตนเฮกซะคลอไรด์กับไฮโดรเจนและมีเทนที่อุณหภูมิ 670 °C (1,238 °F)
 WCl6 + H2 + CH4 WC + 6 HCl
  • ทำปฏิกิริยาระหว่างทังสเตนเฮกซะฟลูออไรด์กับไฮโดรเจนและเมทานอลที่อุณหภูมิ 350 °C (662 °F)
                WF6 + 2 H2 + CH3OH → WC + 6 HF + H2O
       ทังสเตนคาร์ไบด์มีจุดหลอมเหลวที่ 2,870 °C (5,200 °F) และจุดเดือดที่ 6,000 °C (10,830 °F) มีความแข็งระดับ 9 ตามมาตราโมสและประมาณ 2600 ตามมาตราวิกเคอส์[5] ทังสเตนคาร์ไบด์มีความแข็งเกร็งมากกว่าเหล็กกล้าประมาณ 2 เท่า มีค่ามอดุลัสของยังประมาณ 530–700 GPa (77,000–102,000 ksi)[2][6][5][7] โมดูลัสของแรงบีบอัด 630–655 GPa และโมดูลัสของแรงเฉือน 274 GPa[8]
 
ด้วยคุณสมบัติความแข็งและทนความร้อนสูง ทังสเตนคาร์ไบด์จึงใช้ทำเป็นเครื่องมือตัดหรือหัวเจาะ ใช้ทำกระสุนเจาะเกราะ เครื่องมือผ่าตัด อุปกรณ์กีฬา เครื่องประดับและอื่น ๆ
 
 
 
 
 
 
 
 
 
 
อ้างอิง
 
  1. Kurlov, p. 22
  2. Blau, Peter J. (2003). Wear of Materials. Elsevier. p. 1345. ISBN 978-0-08-044301-0.
  3. Pierson, Hugh O. (1992). Handbook of Chemical Vapor Deposition (CVD): Principles, Technology, and Applications. William Andrew Inc. ISBN 0-8155-1300-3.
  4. Zhong, Y.; Shaw, L. (2011). 'A study on the synthesis of nanostructured WC–10 wt% Co particles from WO3 , Co3O4 , and graphite'. Journal of Materials Science 46 (19): 6323–6331. Bibcode:2011JMatS..46.6323Z. doi:10.1007/s10853-010-4937-y.
  5. Groover, Mikell P. (2010). Fundamentals of Modern Manufacturing: Materials, Processes, and Systems. John Wiley & Sons. p. 135. ISBN 978-0-470-46700-8.
  6. Kurlov, p. 3
  7. Cardarelli, François (2008). Materials Handbook: A Concise Desktop Reference. Springer Science & Business Media. pp. 640–. ISBN 978-1-84628-669-8.
  8. Kurlov, pp. 30, 135
  9. Sprince, NL.; Chamberlin, RI.; Hales, CA.; Weber, AL.; Kazemi, H. (1984). 'Respiratory disease in tungsten carbide production workers'. Chest 86 (4): 549–557. PMID 6434250. doi:10.1378/chest.86.4.549.
  10. 12th Report on Carcinogens'. National Toxicology Program. http://ntp.niehs.nih.gov/go/roc12. เรียกข้อมูลเมื่อ 2011-06-24.
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jaipur escort [49.204.164.xxx] เมื่อ 30/12/2022 14:46
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Hello, gentlemen, My name is Pihu Sharma and I belong to Jaipur city which is very beautiful as like my body figure, If you want to spend some special moments with me in Jaipur then you can call me on my website.
 
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Jaipur Escorts [49.204.162.xxx] เมื่อ 30/12/2022 19:01
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nissyyank
Popular conceptions of 'technology' <a href='https://www.techtrendsdaily.com/spacemov/'>Spacemov</a>
 tend to associate that term with activities governed by science and involving important 'hardware' content, i.e., tools, devices, machines. Conversely, 'technique' would pertain to more mundane 
 
ลิงค์ที่เกี่ยวข้อง : https://www.techtrendsdaily.com/spacemov/
nissyyank [103.186.129.xxx] เมื่อ 31/12/2022 14:48
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nissyyank
  Quote from nissyyank 31 Dec 2022, 14:48   
Popular conceptions of 'technolog [url=https://www.techtrendsdaily.com/spacemov/]Spacemov[/url]
tend to associate that term with activities governed by science and involving important 'hardware' content, ie, tools, devices, machines. Conversely, 'technique' would pertain to more mundane activities; built upon non-reflexive 
 
 
ลิงค์ที่เกี่ยวข้อง : https://www.techtrendsdaily.com/spacemov/
nissyyank [103.186.129.xxx] เมื่อ 31/12/2022 14:50
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nissyyank
  อ้างอิงจาก nissyyank 31 ธ.ค. 2565, 14:48   
Popular conceptions of   Spacemov tend to associate that term with activities governed by science and involving important 'hardware' content, i.e., tools, devices, machines. Conversely, 'technique' would pertain to more mundane activities; built upon non-reflexive routines and implying more direct forms of engagements with materials. This view has been severely challenged for the last three decades. As stressed by Haudricourt 'technology
 
 
 
ลิงค์ที่เกี่ยวข้อง : https://www.techtrendsdaily.com/spacemov/
nissyyank [103.186.129.xxx] เมื่อ 31/12/2022 14:52
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