Ua tsis taus pa ntawm lub Nres Nres - Yuav ua li cas lub Hoobkas Tshaj Lij Tswj Porosity rau qhov zoo tshaj plaws kev sib txhuam

Lub nres nres yuav zoo li ruaj, tab sis qhov tseeb nws yog ib qho ntxeem tau sib xyaw. Lub microscopic qhov sib txawv ntawm cov khoom - hu ua porosity lossis void cov ntsiab lus - ua lub luag haujlwm tseem ceeb hauv kev coj tus cwj pwm li cas. Cov porosity ntau dhau, thiab lub ncoo crumbles, hnav sai sai, thiab absorbs noo noo. Cov porosity tsawg dhau, thiab lub ncoo tsis tuaj yeem tso pa tawm thaum lub sijhawm ua haujlwm hnyav, ua rau ploj thiab suab nrov. Lub Hoobkas kev lag luam nres nres ntsuas thiab tswj cov porosity nrog precision, kho nws raws li qhov tseem ceeb tsis zoo nrog kev sib txhuam coefficient thiab shear zog. Kev nkag siab txog qhov porosity yuav pab koj ntsuam xyuas vim li cas qee cov ntaub qhwv tau ntev dua, nres ntau zaus, thiab tiv thaiv squeal.

Dab tsi yog Porosity hauv Nres Nres Nres?

Porosity yog feem pua ​​​​ntawm cov ntaub qhwv lub ntim uas nyob ntawm huab cua lossis voids. Nyob rau hauv ib tug raug neeg nrog caij tsheb nres ncoo, tag nrho porosity ranges ntawm 5% mus rau 15% los ntawm ntim. Cov voids yog tsim thaum lub sij hawm kub nias txheej txheem: raws li cov resin melts thiab ntws, nws tsis tag tag nrho cov khoob ntawm fibers, abrasives, thiab muab tub lim.

Porosity tuaj yeem muab faib ua ob hom:

· Kaw porosity - Cov voids cais tag ib puag ncig los ntawm cov khoom siv. Cov no tsis txuas rau saum npoo.
· Qhib (txuas) porosity – Voids uas ncav cuag qhov sib txhuam nto. Qhib pores yog qhov tseem ceeb rau kev tso pa tawm, tab sis kuj nqus dej thiab cov kab mob.

Porosity cuam tshuam li cas rau kev ua haujlwm

Fade resistance - Thaum lub sij hawm nyuaj braking, cov resin nyob ze ntawm kev sib txhuam decomposes rau hauv gases. Yog tias lub ncoo tsis muaj qhov qhib porosity txaus, cov roj no ua kom lub siab nruab nrab ntawm lub ncoo thiab rotor, tsim kom muaj txheej txheej lubricating uas txo kev sib txhuam - classic ploj. Lub ncoo uas tswj tau zoo qhib porosity tso cai rau cov pa roj kom khiav tawm, tswj kev sib cuag pad-to-rotor. Txawm li cas los xij, qhib porosity ntau dhau ua rau cov qauv ntaub qhwv tsis muaj zog thiab tuaj yeem ua rau hnav.

Hnav tus nqi - Tsawg porosity feem ntau txhais tau hais tias ntau dua thiab zoo dua resin-rau-particle bonding, uas txo qhov hnav. Txawm li cas los xij, yog tias porosity tsawg dhau lawm, lub ncoo ua nkig, ua rau cov npoo chipping lossis tawg hauv thermal stress. Lub Hoobkas yuav tsum nrhiav qhov chaw qab zib rau txhua daim ntawv thov.

Lub suab nrov nrov - Porosity cuam tshuam rau lub ncoo tus yam ntxwv damping. Cov ntaub qhwv uas muaj qhov ntxeem tau zoo yuav nqus tau kev co thiab tsim cov squeal tsawg, tab sis lawv kuj yuav hnov ​​​​"mos" lossis "spongy." Low-porosity pads yog firmer tab sis tuaj yeem xa cov kev vibrations ntau dua, ua rau muaj suab nrov.

Moisture rhiab heev - Siab qhib porosity absorbs dej los ntawm cov huab cua ntub los yog puddles. Cov ntaub ntub dej tau txo qhov pib tom (ntub ploj) thiab yuav siv sij hawm ntau nres kom qhuav. Low-porosity pads tsis tshua muaj kev cuam tshuam los ntawm cov dej noo tab sis tuaj yeem cuam tshuam cov dej sab hauv, ua rau muaj kev cuam tshuam tsis zoo.

Corrosion thiab xeb jacking - Yog tias qhib porosity txuas mus rau lub phaj rov qab, cov dej noo tuaj yeem ncav cuag cov hlau, ua rau xeb uas nthuav tawm thiab thawb cov khoom sib txhuam tawm mus - delamination. Lub Hoobkas yuav tsum xyuas kom meej tias cov primer thiab bonding txheej kaw lub interface, tiv thaiv kev sib tshuam porosity.

Yuav Ua Li Cas Ib Lub Hoobkas Tshaj Lij Tswj Porosity

Porosity yog txiav txim los ntawm peb yam tseem ceeb:

1. Raw khoom particle loj tis - Ib tug sib tov ntawm txawv particle loj packs ntau nruj, txo porosity. Uniform particle qhov ntau thiab tsawg tawm qhov khoob loj dua. Factories kho qhov sib tov kom ua tiav lub hom phiaj ntim ntim.
2. Nias siab - Siab siab compresses cov hmoov ntau ntom, txo porosity. Qhov siab tshaj plaws ntawm 300 mus rau 500 kg / cm². Factories nrog precision hydraulic presses muaj peev xwm tuav lub siab nyob rau hauv ± 2%, kom ntseeg tau zoo ib yam porosity batch rau batch.
3. Pre-form ntom ntom - Qhov ntom ntom ntawm cov hmoov ua ntej nias cuam tshuam qhov porosity kawg. Factories tswj qhov no los ntawm kev tswj qhov tob tob thiab ua ntej compression.

Ntsuas Porosity hauv lub Hoobkas

Cov kws tshaj lij factories tsis twv porosity. Lawv siv:

· Archimedes (dej hloov chaw) txoj kev - Ib lub qhov hnyav hnyav yog boiled nyob rau hauv dej los ua kom qhib lub qhov hws, ces rov hnyav hauv qab dej thiab hauv huab cua. Kev suav yields qhib porosity, kaw porosity, thiab tag nrho porosity. Qhov no yog tus qauv kev lag luam.
· Mercury intrusion porosimetry - Ntau qhov tseeb tab sis yuav tsum muaj cov cuab yeej kim thiab cov mercury txaus ntshai. Siv rau R & D, tsis niaj hnub QC.
· Microscopy (daim duab tsom xam) – Cov duab hla ntu tau txheeb xyuas los ntsuas qhov feem pua ​​​​ntawm thaj chaw tsis muaj dab tsi. Pab kom pom qhov pore faib.

Lub Hoobkas teeb tsa cov kev txwv tshwj xeeb rau txhua tus qauv kev sib txhuam. Piv txwv li, cov neeg caij tsheb ceramic yuav xav tau tag nrho cov porosity 8-12%, nrog qhib porosity tsis tshaj 6%. Cov khoom siv sab nraum cov kev txwv no raug tsis lees paub.

Cov neeg yuav khoom yuav tsum nug dab tsi

Thaum ntsuam xyuas lub Hoobkas nres nres, nug:

· Koj puas ntsuas porosity ntawm cov khoom tsim khoom? Koj siv txoj kev twg?
· Dab tsi yog tag nrho cov porosity thiab qhib porosity ntau rau koj cov kab ceramic / semi-metallic?
· Koj ua li cas kom ntseeg tau qhov porosity zoo ib yam los ntawm batch mus rau batch - koj muaj cov txheej txheem dab tsi?
· Koj puas tuaj yeem muab cov ntaub ntawv porosity rau cov lej uas kuv xav xaj?

Factories uas kho porosity raws li tus cwj pwm zoo tseem ceeb yuav muab cov lej thiab piav qhia lawv lub hom phiaj. Cov chaw tsim khoom uas hais tias "peb tsis ntsuas qhov ntawd" yuav ua rau cov ntaub qhwv tsis sib xws nrog qhov tsis tuaj yeem ploj, suab nrov, thiab hnav.

Kab hauv qab

Porosity yog qhov zais pa ntawm lub ncoo nres. Tsawg dhau, thiab lub ncoo chokes ntawm nws tus kheej gases, ua rau ploj mus. Ntau dhau, thiab nws haus dej noo, hnav sai, thiab muaj kev pheej hmoo delamination. Lub Hoobkas kev tshaj lij tswj cov porosity los ntawm kev xaiv cov khoom siv raw, nias precision, thiab kev kuaj niaj hnub. Raws li tus neeg yuav khoom, hais rau cov ntaub ntawv porosity kom ntseeg tau tias koj tau txais cov pawm uas ua pa kom zoo - nres kev nyab xeeb thiab ntsiag to, nres tom qab nres.