Tungsten carbide. Lub cev nqaij daim tawv, toxicity, application

Tungsten carbide (tseem hu ua tungsten monocarbide) yog ib qho tshuaj siv ntawm tungsten, carbon, thiab ceramics. Qhov no tshuaj yog ib tug ntawm cov muaj zog ntawm tag nrho cov paub ceramics nrog hardness piv rau pob zeb diamond: HRC yog nyob ib ncig ntawm 90 units hauv Mohs Mohs occupies cuaj qhov chaw. Lwm qhov zoo ntawm tungsten carbide yog kev coj ua zoo, siab melting point thiab zoo heev tsis kam mus oxidation. Cov khoom siv tam sim no nquag siv los tsim lub cuab tam thiab cov cores ntawm cov cuab yeej ua rog.

Lub cev thaj chaw ntawm tungsten carbide

1. Raws li cov xeeb ceem, tungsten carbide granular yog cov hmoov ntawm cov xim xim muaj xim nrog nws lub cev.

2. Muab cov dej yaug.

3. Rockwell hardness yog los ntawm 87 txog 92 units.

4. Qhov nruab nrab ntawm lub pob tungsten carbide yog 2870 degrees.

5. Qhov ceev yog 15.8 g / cm3.

6. Lub modulus ntawm elasticity yog 450 ÷ 650 GPa

7. Qhov txig thermal yog 8.4 +/- 0.2 kcal / mole

8. Lub qhov ntsuas ntawm tus qauv yog 8.5 +/- 1.5 calories / (mole ib lawg).

9. Cov cua kub nruab nrab ntawm qhov sib npaug li 293 degrees yog 8.53 calories / (mole ib lawg).

10. Thermal conductivity nyob rau ntawm ambient qhov kub ntawm 25 degrees yog 0.07 cal / (centimeter / s / degree).

11. Lub thermal expansion coefficient yog 3.84 (3.9) × 106 deg-1.

12. Cov hluav taws xob tiv thaiv ntawm qhov kub ntawm 200 degrees yog 19.2 +/- 0.3 microohm / centimeter.

13. Cov hluav taws xob conductivity ntawm cov kev yog 52200 Ohm-1 * cm-1.

Tus qauv ntawm tungsten carbide

Nyob ntawm tam sim no ob hom ntawv WC paub - β-WC high-temperature cubic thiab α-WC hexagonal.

Daim ntawv thov tungsten carbide

- hauv cov txheej txheem los ua cov cuab yeej uas yuav tsum tau muaj kev kub ntxhov thiab kev txhuam kom zoo;

- kev hnav tau-resistant surfacing ntawm ntau qhov chaw uas yuav raug siv nyob rau hauv tej yam mob uas hnav hnav nrog cov khoom nruab nrab qhov nruab nrab;

- thoob daim ntawv thov kev tsim ntawm ntau cov cutters, drills, abrasive disks, me me rau drilling, milling cutters thiab lwm yam cuab yeej txiav;

- Tus nqi ntawm tungsten ua rau nws cov phoojywg hauv ntau qhov chaw (nws yog nyob rau hauv qhov muaj pes tsawg leeg paub cov npe hu ua "Wins" thiab "Relit," txog 90%);

- siv nyob rau hauv surfacing thiab roj-thermal txau rau hauv daim ntawv ntawm ib cov hmoov ua khoom siv rau kev siv ua khoom ntawm lub tsho uas tiv taus;

- qhov no yog ib qho ntawm cov khoom siv los hloov cov chromium plating txheej txheem uas siv roj-nplaim taws-ceev txau;

- tam sim no tungsten carbide yog hom nyob rau hauv lub chaw ua khoom ntawm projectiles thiab tej cuab yeej tho cia nyias cores (Txawm li cas los, muaj ib tug ib txwm ntawm gradual xaav tungsten carbide du) ;

- nyob rau hauv cov khoom hnyav ntawm cov khoom hnyav uas muaj qhov loj ntawm 1 hli rau pob cwjmem (polishing yog kwv nyob rau hauv ib qho khoom tshwj xeeb rau ob peb hnub uas siv lub me me ntawm diamond paste);

- nyob rau hauv cov khoom ntawm bracelets rau elite Swiss watches, hniav nyiaj hniav kub - rings, bracelets thiab coulombs, uas vim lub hnav tsis kam ntawm tungsten carbide yog guaranteed eternal ci;

- siv los ua ib qho tshuaj rau cov khoom ua tau los ntawm platinum;

- tungsten carbide siv los tsim cov kawg cov ntsaws ruaj ruaj shafts ntawm ib co mechanisms nyob rau hauv tus neeg mob qhov twg cov ib puag ncig muaj ib tug high viscosity thiab / los yog abrasiveness.

Toxicity ntawm tungsten carbide

Qhov yeeb tshuaj no sib chwv sib luag. Vim li no, nyob hauv ib txwm ua haujlwm, nws tsis muaj kev txaus ntshai rau tib neeg. Qhov kev ua kom ua kom tuag tsis yog txiav txim rau tib neeg los yog tsiaj txhu. Kev tshawb fawb uas tau raug ua nyob rau Dresden Kev thiab University of Leipzig, pom tias tsuag tungsten carbide yuav txeem mus rau hauv uas muaj sia nyob. Tib lub sijhawm, kev nplua tsis zoo yog tsis muaj cov tshuaj lom, tab sis thaum ua ke nrog qee lub tshuaj yeeb dej caw lawv ua rau muaj kev phom sij rau qhov zoo ntawm lub hlwb. Nrog ntev cobalt cobalt hmoov av thiab cov khoom uas peb xav tau, fibrosis tuaj yeem tsim hauv lub cev.