Yuav ua li cas los txhim kho lub hardness thiab hnav tsis kam ntawm TC11 alloy raj, titanium alloy khoom

Carburization ntawm titanium alloy tsim TiC theem ntawm qhov chaw, uas muaj hardness siab heev. Txawm li cas los xij, kev sib txuas ntawm TiC txheej nrog substrate yog qhov tsis zoo, uas cuam tshuam rau kev siv tswv yim. Kub kub heev yuav ua rau kom loj hlob ntawm titanium carbide nplej:

1. Sintering kub. Qhov kawg sintering kub ntawm titanium carbide siab manganese steel hlws ris cemented carbide feem ntau yog coj li 1420 degree, uas yog tsim nyog. Sintering kub yuav tsum tsis txhob siab dhau. Txawm tias ua rau cov txheej txheem sib txuas ua kua theem hlau poob, kom cov theem nyuaj tshwm sim nyob sib ze, sib sau ua ke thiab kev loj hlob, tsim cov pob txha tawg. Qhov no yog vim li cas vim li cas qhov kev sib koom ua ke ntawm cov nplej ntawm cov theem nyuaj uas tau txheeb xyuas ua ntej yuav tsawg dua. Tau kawg, qhov kub ntawm sintering yuav tsum tsis txhob qis dhau, txwv tsis pub cov hlau yuav raug underfired. Tshwj xeeb tshaj yog nyob rau hauv 3 theem ntawm debonding, txo thiab kua theem sintering.

2, sintering cua kub ceev. Xws li alloy sintering cua sov ceev yuav tsum tsis txhob ceev. Txhawm rau tswj xyuas cov cua sov ceev thiab tuav lub sijhawm. Vim hais tias nyob rau hauv lub qis-kub degumming theem, lub billet tso tawm compression kev nyuaj siab thiab tsim tus neeg sawv cev volatilization txheej txheem, yog hais tias lub cua sov ceev ceev, nws yog lig dhau lawm rau lub volatilization ntawm lub forming tus neeg saib xyuas thiab liquefaction rau hauv lub chav, yog li ntawd lub billet bursting. los yog microcracking phenomenon; 900 degree saum toj no theem txo, kom cov billet muaj sij hawm txaus los tshem tawm cov ntaub ntawv raw siv nyob rau hauv cov hmoov (xws li, Mn2Fe intermediate alloy) nyob rau hauv lub volatiles thiab oxygen; mus rau hauv cov kua theem sintering theem, nws tseem yuav tsum tau Thaum nkag mus rau hauv cov kua theem sintering theem, nws tseem yuav tsum tau kom qeeb tus nqi ntawm kub nce nyob rau hauv thiaj li yuav ua rau lub billet tag nrho alloyed.

Titanium ntawm qhov kub thiab txias yuav hnov ​​​​mob nrog oxygen, nitrogen thiab lwm yam gases, ua rau hardening, siab kub (800-900 degrees) rau nitriding, kom nws nto Vickers hardness mus txog 700 los yog ntau tshaj; los ntawm cov surfacing, nyob rau hauv cov roj argon uas tsim nyog tus nqi ntawm nitrogen los yog oxygen, kom lub deg hardness yuav nce los ntawm 2-3 zaug; los ntawm cov ion plating, kom lub nto ntawm lub cim ntawm ib txheej ntawm titanium nitride, lub thickness nyob rau hauv lub 5 Lub thickness yog hais txog 5 microns, thiab nto Vickers hardness yog siab li 16, 000-20, {{ 7}}; chromium plating thiab lwm yam. Thaum nitriding, cov cheeb tsam sib txawv tuaj yeem tsim, yog tias cov ntsiab lus oxygen tsis siab dhau, thaj tsam sab nrauv tsim los ntawm titanium nitride, uas muaj xim kub thiab hardness ntawm 14,000-17,000 MPa, tab sis txheej txheej titanium nitride no nyuaj heev los tsim vim tias thaum qhov kub thiab txias ntawm nitriding tsawg, lossis thaum nws tau rhuab mus rau qhov kub siab (annealing), nitrogen tau yaj tag rau hauv cov tshuaj titanium ntawm cov hlau, thiab txheej txheej titanium nitride tsis tau nce lossis ploj lawm thaum lub sijhawm kho cua sov. Yog li ntawd, thaum pom cov titanium nitride txheej, titanium cov khoom tov txheej twb yaj mus rau hauv cov nitrogen, thiab cov txheej no kuj muaj ib tug siab hardness, tab sis cov tub ntxhais hardness txo. Thaum ammonia siv rau nitriding, ntxiv koom haum hloov pauv tshwm sim vim cov nyhuv ntawm hydrogen permeation. Titanium nitride yog tawv thiab hluav taws xob conductive. Lub tshav kub ntawm tiam ntawm titanium nitride tshaj li ntawm tag nrho cov titanium oxides. Yog li ntawd, kev saib xyuas kuj yuav tsum tau ua kom cov txheej txheem nitriding yog nqa tawm nyob rau hauv cov xwm txheej ntawm kev tshem tawm cov pa kom tiav. Cov tshuaj tiv thaiv nto ntawm titanium thiab nitrogen ua raws li tus qauv parabolic dhau sijhawm. Yog li ntawd, tus nqi nitriding txo nrog nce nitriding lub sij hawm. Vim hais tias qhov diffusion tus nqi ntawm nitrogen nyob rau hauv nitrided titanium txheej yog tsawg tshaj li nyob rau hauv cov kua cheeb tsam ntawm cov titanium cov kua hauv qab no, nws yog tsis yooj yim sua los tsim ib tug tuab nitrided txheej, thiab cov nitrogen los yog ammonia yuav tsum muaj siab purity. Vim tias cov pa oxygen tsis tsuas yog tiv thaiv kev tsim ntawm nitride txheej, tab sis kuj ua rau cov txheej saum npoo kom tshem tawm cov oxide ntawm daim tawv nqaij ntawm qhov kub thiab txias, cov ntsiab lus noo noo (humidity) yuav tsum tsawg dua li qhov no, txawm tias nws ncav cuag lub melting point.

Boron infiltration ntawm titanium nto tsim TiB2 theem, uas kuj nyuaj heev. Raws li cov ntaub ntawv, cov khoom titanium pickled embedded nyob rau hauv amorphous boron hmoov thiab A1203 hmoov ib nrab ntawm cov hmoov sib tov (uas ntxiv 0.75% - 1.0% ntawm cov NH4F * HF) nyob rau hauv 1010 degrees ntawm tshav kub preservation rau 1 teev, koj muaj peev xwm tsim TiB2 txheej. Nyob rau hauv cov xwm txheej saum toj no, lub thickness ntawm txheej txawv raws li cov alloys sib txawv, muaj ntshiab titanium txheej thickness ntawm 25p, TC4 titanium alloy tsim nyob rau hauv thickness ntawm 20um, hardness nyob rau hauv ntau yam ntawm HV2800-3450. Boron nkag mus rau qhov kub thiab txias, uas ua rau nws daim ntawv thov raug rau qee yam kev txwv. Yog tias thawj zaug hauv titanium phaj electroplating hlau, ua raws li boronization, tuaj yeem txo qhov kub ntawm boronization mus rau 870 degrees Celsius, txheej thickness txog li 40um, hardness yuav mus txog HV2300. vim titanium kuj reacts nrog nitrogen, yog li nws yuav tsum tau siv raws li ib tug cab kuj argon. Yog tias koj siv cov pa oxygen / nitrogen gas sib tov (cua) raws li cov pa oxygen, uas nyob rau hauv qhov kub ntawm oxygen diffusion (kwv yees li 850 ° C) yuav tsim nitride txaus nws yuav txo tau cov pa diffusion. Txhawm rau txhawm rau txhim kho qhov tob thiab kev faib tawm ntawm cov pa oxygen diffusion txheej, cov pa oxygen concentration yuav tsum tau siab txaus los tsim kom muaj qhov sib txawv loj. Txawm li cas los xij, nws tsis tuaj yeem siab txaus los tsim cov yeeb yaj kiab oxide txuas ntxiv, uas tau tshaj tawm los thaiv kev sib kis.

Lub hom phiaj ntawm qhov chaw hardening yog txhawm rau txhim kho kev hnav tsis kam thiab tshem tawm txoj kev pheej hmoo ntawm kev sib koom ua ke ntawm qhov chaw ua haujlwm hauv kev sib txhuam. Nws muaj peev xwm hais tias qhov nce hauv hardness yog nrog los ntawm kev nce hauv corrosion kuj thiab qaug zog. Thawj qhov kev txhawj xeeb ntawm no yog kev txhim kho ntawm qhov tawv tawv, cov txheej txheem nws tus kheej thiab nws cov kev cuam tshuam rau kev txhim kho ntawm qhov tawv tawv. Nto hardening yuav tsum tau nqa tawm thiab tswj kom zoo nyob rau hauv lub cub tawg nrog ib tug muaj zog tiv thaiv huab cua, uas tso cai rau cov roj muaj pes tsawg leeg nyob rau hauv lub kawg ntawm kev kho mob yuav tsum tau yooj yim varied nyob rau hauv thiaj li yuav tsim ib homogeneous non-porous rutile txheej. Qhov tshwm sim zoo ib yam li cov txheej txheem TO. Nyob rau hauv txoj kev no, nws yog ib kauj ruam ib kauj ruam, tsis hais txog peb-kauj ruam txheej txheem raws li nyob rau hauv cov ntaub ntawv ntawm BDO / TO ua ke txheej txheem, uas ua rau lub zog txuag tseem ceeb. Cov txheej txheem siv tsuas yog inert gases - argon thiab oxygen - thiab yog li ntawd ib puag ncig tus phooj ywg, tsis muaj tshuaj lom thiab tsis ua rau cov nyhuv tsev cog khoom. Txawm hais tias cov txheej txheem yog qhov zoo, kev kho lub tshuab nqus tsev yog kim thiab muaj teeb meem kev tswj xyuas hauv ob-kauj ruam oxidation / diffusion txheej txheem. Txawm hais tias lub sijhawm diffusion hauv lub tshuab nqus tsev yog tsau, qhov kev hloov me me ntawm cov oxides tsim nyob rau hauv cov kauj ruam tuaj yeem ua rau muaj qhov sib txawv tseem ceeb hauv kev faib cov hardness tom ntej.