Tungsten carbide. The nkịtị Njirimara, toxicity, ojiji nke

Tungsten carbide (aha ọzọ - tungsten monocarbide) - a chemical compound nke tungsten, carbon, na ceramik. Nke a na umi bụ otu ike nke niile mara ceramik na ekweghị ekwe tụnyere diamond: HRC bụ na gburugburu 90 nkeji na Mohs Mohs enyene itoolu ebe. Ọzọ akụkụ dị mma nke tungsten carbide bụ ezi wear eguzogide, elu agbaze okpomọkụ na magburu onwe iguzogide ọxịdashọn. Nke a ihe onwunwe ugbu a n'ọtụtụ ebe na ike a ọnwụ ngwá ọrụ isi ma na ihe-agha-ịkpọpu shells.

Physical Njirimara nke tungsten carbide

1. nkịtị ọnọdụ granular tungsten carbide ntụ ntụ bụ a dara awọ ẹkenemede.

2. soluble n'ime mmiri.

3. Rockwell ekweghị ekwe nke si 87 ka 92 nkeji.

4. The agbaze okpomọkụ nke tungsten carbide bụ 2870 degrees.

5. The njupụta bụ 15,8 g / santimetr³.

6. The agbanwe modulus bụ 450 ÷ 650 GPa

7. Mmetụta nke okpomọkụ hà 8.4 +/- 0,2 kkalory / mol

8. The entropy ọkọlọtọ bụ 8.5 +/- 1.5 calories / (ahumachi kwa n'ókè).

9. The kpọmkwem okpomọkụ na okpomọkụ hà 293 degrees bụ 8,53 calories / (ahumachi kwa n'ókè).

10. Kwes conductivity na ambient okpomọkụ nke 25 degrees bụ 0,07 cal / (cm / s / ° C).

11. The thermal mgbasa ọnụọgụ bụ 3,84 (3,9) * 106 1 deg.

12. The eletriki resistivity na okpomọkụ nke 200 ogo bụ 19,2 +/- 0.3 microohm / cm.

13. The eletriki conductivity nke kpọmkwem bụ 52200 Ohm-1 * cm-1.

Structure tungsten carbide

The ugbu a na-mara abụọ iche nke WC - β-WC elu-cubic na hexagonal α-WC.

Jiri nke tungsten carbide

- na nkà maka imewe nke ngwaọrụ nke ga-enwe elu ekweghị ekwe na ezi corrosion eguzogide;

- maka wear na-eguzogide surfacing nke dị iche iche na-ejikwara dị arọ wear ka nkezi ujo ibu;

- ọtụtụ-eji imewe nke dị iche iche na ọnwụ ngwaọrụ, u, egweri wiil, malite ịgba ibe n'ibe maka mkpọpu ala,-egwe ọka na ndị ọzọ na ọnwụ ngwaọrụ;

- na-eri nke tungsten enye ohere iji ihe alloys na dịgasị iche iche (ya na-emi esịnede ike alloys, mara n'okpuru aha "Victory" na "Relit", banyere 90%);

- eji na thermal spraying na surfacing n'ụdị powder a ihe na-amị abrasion na-eguzogide coatings;

- bụ otu n'ime ihe iji dochie chromium plating usoro electroplating a elu-ọsọ ire ọkụ spraying;

- ugbu a na-tungsten carbide bụ akara ererimbot na imewe nke projectiles na agha ịkpọpu mgbọ cores (ọ dị, e nwere a ọchịchọ nke gradual Ndahie nke tungsten carbide du) ;

- na mmepụta nke ultra chaplet nke 1 mm maka ballpoint itienna (polishing a rụrụ n'ime pụrụ iche ngwa ruo ọtụtụ ụbọchị, eji obere ego nke diamond tapawa);

- ke imewe nke ọla J.Randall Switzerland ese, ọla - yiri mgbaaka, ọla aka na nile anākwuba na nti, nke ruru ka wear eguzogide tungsten carbide ekwe nkwa ebighi luster;

- eji dị ka a ụgbọelu maka a platinum mkpali +

- tungsten carbide ji kee ọgwụgwụ akàrà akụ ụfọdụ usoro ikpe ebe nwere a elu viscosity na / ma ọ bụ abrasiveness.

Tungsten carbide toxicity

A ihe onwunwe bụ na ya inert. N'ihi nke a, na nkịtị ọnọdụ, ọ na-adịghị inwe ọ bụla ihe ize ndụ ụmụ mmadụ. The kpara dose na-adịghị kọwaa ma ụmụ mmadụ ma ọ bụ anụmanụ. Studies na e duziri na Dresden na ụzụ na University of Leipzig, gosiri na agbasara tungsten carbide nwere ike iru n'ime ndu eme ntule. Ebe ezi ahụ ndị na-abụghị na-egbu egbu, ma mgbe jikọtara na ụfọdụ bekee ha mejupụtara ihe ize ndụ maka ọdịmma nke gị niime ụlọnga. Mgbe ụgwọ ọkọkpọhi cobalt ájá na anyị na-atụle isi ihe na ahụ ike ịzụlite fibrosis.