Silicon Carbide Ceramic

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Silicon carbide bụ ụdị carbide sịntetik nwere molekul SiC. Mgbe a na-enye ike, silica na carbon na-etolitekarị na okpomọkụ dị elu karịa 2000 ° C. Silicon carbide nwere njupụta usoro iwu nke 3.18g/cm3, ike Mohs na-esote diamond, yana microhardness nke 3300kg/mm3 n'etiti 9.2 na 9.8. N'ihi ike siri ike ya na akwa mkpuchi akwa, ọ nwere njirimara nke nguzogide okpomọkụ dị elu ma jiri ya mee ihe dị iche iche nke na-eguzogide ọgwụ, corrosion na-eguzogide na okpomọkụ dị elu. Ọ bụ ụdị teknụzụ seramiiki ọhụrụ nke na-agaghị eyi.

1. Chemical Njirimara.

(1) Nguzogide oxidation: Mgbe ihe silicon carbide na-ekpo ọkụ na 1300 Celsius C na ikuku, oyi akwa mkpuchi silicon dioxide na-amalite imepụta n'elu kristal silicon carbide kristal. Na ndim nke oyi akwa mkpuchi, ihe dị n'ime silicon carbide na-aga n'ihu na-eme ka ọ ghara ịdị na-eme ka ọ ghara ịdị na-eme ka ọ dị mma, nke mere na silicon carbide nwere ezigbo nkwụsị oxidation. Mgbe okpomọkụ ruru ihe karịrị 1900K (1627 Celsius C), ihe nkiri nchebe silicon dioxide na-amalite imebi, na oxidation nke silicon carbide na-esiwanye ike, ya mere 1900K bụ okpomọkụ na-arụ ọrụ nke silicon carbide na ikuku oxidizing.

(2) Acid na alkali nguzogide: n'ihi ọrụ nke ihe nkiri nchebe silicon dioxide, silicon carbide nwere ihe onwunwe na ọrụ nke ihe nkiri nchebe silicon dioxide.

2. Ahụ na n'ibu Njirimara.

(1) Njupụta: The urughuru njupụta nke dị iche iche silicon carbide kristal dị nnọọ nso, n'ozuzu na-ewere na-3.20g / mm3, na eke mbukota njupụta nke silicon carbide abrasives bụ n'etiti 1.2-1.6g / mm3, dabere na urughuru size, urughuru size mejupụtara na urughuru size udi.

(2) Ike: Mohs siri ike nke silicon carbide bụ 9.2, micro-density nke Wessler bụ 3000-3300kg / mm2, ike nke Knopp bụ 2670-2815kg / mm, abrasive dị elu karịa corundum, nso diamond, cubic boron nitride na boron carbide.

(3) Thermal conductivity: ngwaahịa silicon carbide nwere nnukwu okpomọkụ conductivity, obere okpomọkụ mgbasa ọnụ ọgụgụ, elu thermal ujo na-eguzogide, na elu-edu refractory ihe.

3. Eletriki Njirimara.

Ihe Nkeji Data Data Data Data Data
RBsic (siic) NBSiC SSiC RSiC OsiC
Ọdịnaya SiC % 85 76 99 ≥99 ≥90
Ọdịnaya silicon efu % 15 0 0 0 0
Oke ọrụ okpomọkụ 1380 1450 1650 1620 1400
Njupụta g/cm^3 3.02 2.75-2.85 3.08-3.16 2.65-2.75 2.75-2.85
Mepee porosity % 0 13-15 0 15-18 7-8
Ike na-ehulata 20 ℃ Mpa 250 160 380 100 /
Ehulata ike 1200 ℃ Mpa 280 180 400 120 /
Modul nke elasticity 20 ℃ Gpa 330 580 420 240 /
Modul nke elasticity 1200 ℃ Gpa 300 / / 200 /
Thermal conductivity 1200 ℃ W/mk 45 19.6 100-120 36.6 /
Ọnụọgụ nke thermalexpansion K^-lx10^-8 4.5 4.7 4.1 4.69 /
HV kg/m^m2 2115 / 2800 / /