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ทังสเตนคาร์ไบด์

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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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Guwahati Escorts [223.235.54.xxx] เมื่อ 23/03/2023 19:08
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mega168

จุดเด่นเกมสล็อต mega168 ตัวเกมสล็อตรูปแบบใหม่ที่น่าสนใจอย่างมาก และทำให้สล็อตพีจี กลายเป็นค่ายเกมชั้นนำแนวหน้าของเมืองไทย ที่ใครเป็นนักปั่นสล็อตตัวจริง บอกเลยว่าไม่ควรพลาด

 
 
mega168 [182.232.182.xxx] เมื่อ 23/03/2023 21:45
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สล็อตทดลองเล่น
pgใหม่ล่าสุด หากคุณเลือกที่จะเป็นส่วนหนึ่งกับเรา จะได้พบกับโปรโมชั่นสุดพิเศษอย่าง โปรสล็อตแจกเครดิตฟรี สล็อตทดลองเล่น เล่นได้ทุกเกม หากชนะเงินถอนได้ทันที
 
สล็อตทดลองเล่น [182.232.182.xxx] เมื่อ 23/03/2023 21:45
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สล็อต ออนไลน์

ฝาก-ถอนไม่อั้น ไม่มีขั้นต่ำ เล่นได้ จ่ายจริง ปลอดภัย100% เล่นเกม สล็อต ออนไลน์ หรือทดลองเล่นสล็อตกับเราได้ฟรี ๆ ไม่ต้องสมัคร ไม่มีค่าใช้จ่าย และไม่ต้องดาวน์โหลด เล่นได้ตลอด 24 ชั่วโมง

 
 
สล็อต ออนไลน์ [182.232.182.xxx] เมื่อ 23/03/2023 21:46
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รวมโปร ทุนน้อย pg
หากคุณกำลังมองหาเว็บไซต์ที่ปลอดภัย รวมโปร ทุนน้อย pg เล่นได้เงินจริง ถอนได้จริง เว็บของเราตอบโจทย์ความต้องการในการเล่นมากที่สุด เกมสล็อต ค่าย pg แตกง่าย เกมสล็อตชัวร์100%
 
รวมโปร ทุนน้อย pg [182.232.182.xxx] เมื่อ 23/03/2023 21:46
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