Common Sintering khib nyiab thiab ua rau

Lub ntsiab tivthaiv ntawm cemented carbide yog micro-sized tungsten carbide hmoov ntawm siab hardness. Cemented carbide yog cov khoom kawg ua nrog hmoov metallurgy thiab sintered nyob rau hauv lub tshuab nqus tsev vacuum los yog hydrogen reduction cub. Cov txheej txheem siv cobalt, npib tsib xee, los yog molybdenum ua tus khi. Sintering yog ib qho tseem ceeb heev hauv cov cemented carbide. Cov txheej txheem sintering yog kom sov cov hmoov sib tov rau ib qho kub, khaws cia rau qee lub sijhawm, thiab tom qab ntawd txias nws kom tau txais cov khoom siv nrog cov yam ntxwv xav tau. Cov txheej txheem sintering ntawm cemented carbide yog qhov nyuaj heev, thiab nws yooj yim los tsim cov khib nyiab sintered yog tias koj ua yuam kev. Kab lus no yuav tham txog qee yam sintering khib nyiab thiab dab tsi ua rau cov khib nyiab.

1. Peeling

Thawj hom sintering pov tseg yog tev. Peeling yog thaum nto ntawm cemented carbide tshwm nrog cov kab nrib pleb ntawm cov npoo thiab warping shells. Tsis tas li ntawd, qee qhov tshwm sim me me tawv nqaij zoo li ntses nplai, tawg tawg, thiab txawm pulverization. Lub tev yog feem ntau yog los ntawm kev sib cuag ntawm cobalt nyob rau hauv lub compact, thiab ces cov pa roj carbon monoxide decomposes dawb carbon nyob rau hauv nws, ua rau ib tug txo nyob rau hauv lub zos lub zog ntawm lub compact, uas ua rau tev.

2. Qhov pores

Qhov thib ob feem ntau sintering pov tseg yog pom tseeb qhov pores ntawm cov cemented carbide nto. Qhov uas muaj tshaj 40 microns yog hu ua pores. Txhua yam uas tuaj yeem ua rau npuas yuav ua rau qhov pores ntawm qhov chaw. Tsis tas li ntawd, thaum muaj impurities nyob rau hauv lub cev sintered uas tsis wetted los ntawm molten hlau los yog sintered lub cev muaj ib tug loj cov khoom theem thiab cov segregation ntawm cov kua theem yuav ua rau pores.

3. Npuas

Npuas yog thaum muaj qhov nyob hauv cov cemented carbide thiab ua rau bulges ntawm qhov chaw ntawm qhov sib thooj. Qhov laj thawj tseem ceeb ntawm cov npuas yog tias lub cev sintered muaj cov pa roj ntau. Concentrated gas feem ntau muaj ob hom.

4. Cov qauv tsis sib xws tshwm sim los ntawm kev sib xyaw cov hmoov sib txawv.

5. Deformation

Qhov tsis sib xws ntawm lub cev sintered yog hu ua deformation. Cov laj thawj tseem ceeb rau kev deformation muaj xws li: qhov ntom ntom ntawm cov compacts tsis sib xws; lub cev sintered yog qhov tsis txaus ntawm carbon hauv zos; lub nkoj thauj khoom tsis tsim nyog, thiab lub phaj rov qab tsis sib xws.

6. Dub Center

Qhov chaw xoob ntawm lub pob txha tawg yog hu ua qhov chaw dub. Qhov ua rau ntawm qhov chaw dub yog cov ntsiab lus carbon ntau dhau lossis cov ntsiab lus carbon tsis txaus. Txhua yam uas cuam tshuam rau cov ntsiab lus carbon ntawm lub cev sintered yuav cuam tshuam rau qhov chaw dub ntawm carbide.

7. Kev tawg

Kev tawg kuj yog ib qho tshwm sim hauv cov cemented carbide sintered pov tseg. Muaj ob hom kab nrib pleb, ib qho yog compression tawg, thiab lwm yam yog oxidation tawg.

8. Hla hlawv

Thaum lub sintering kub siab dhau los yog lub sij hawm tuav ntev dhau lawm, cov khoom yuav raug hlawv. Kev kub hnyiab ntau dhau ntawm cov khoom ua rau cov nplej thicker, qhov pores nce, thiab cov khoom alloy txo qis. Cov hlau nplaum ntawm cov khoom raug rho tawm haujlwm tsis pom tseeb, thiab nws tsuas yog yuav tsum tau rov ua haujlwm dua.