1, tini kunyudza maitiro

Kana inopisa mvura solder ichinyungudika uye ichipinda mukati mesimbi pamusoro peiyo PCB kutengeswa, inonzi simbi yekubatanidza kana simbi yekubatanidza. Mamorekuru emusanganiswa weSolder nemhangura vanoumba chiwanikwa chitsva icho chiri chikamu chendarira uye chikamu chinosungirirwa. Iyi solvent chiito inonzi tin-kusunga. Iyo inoumba chisungo chemuviri pakati pezvikamu zvakasiyana zvePCB, ichigadzira simbi yechigadzirwa chesimbi. Kuumbwa kwezvakanaka zvemukati mamolecular zvisungo ndiko musimboti wePCB yekumonera maitiro, ayo anosarudza kusimba uye mhando yePCB welding points. Tin inogona kusvibiswa chete kana iyo yemhangura pamusoro isina kusvibiswa uye oxide firimu yakaumbwa nekuda kwePCB kusvibiswa nemhepo, uye iyo solder nenzvimbo inoshanda zvinoda kusvika pakakodzera tembiricha.

2. Surface makakatanwa

Wese munhu anoziva nezvekumanikidza kwemvura, iro simba rinochengeta madonhwe emvura anotonhora idenderedzwa pane yakazorwa pcb yesimbi nekuti, mune iyi kesi, kunamatira uko kunowanzoparadzira mvura pane yakasimba nzvimbo kwakaderera pane kubatana kwayo. Shamba nemvura inodziya uye sipo yekudzora kusagadzikana kwepasi. Mvura inozadza iyo yakakora pcb yesimbi simbi uye yoyerera ichienda kunze kuti igadzire yakatetepa, inoitika kana iko kunamatira kuri kukuru kupfuura kubatana.

Tin-lead solder yakatonyanya kubatana pane mvura, ichiita iyo solder idenderedzwa kuti ideredze nzvimbo yayo (yevhoriyamu imwe chete, iyo sphere ine diki kwazvo nzvimbo inoenzaniswa nemamwe mageometri kusangana nezvinodiwa zvesimba rakaderera simba). Mhedzisiro yekuyerera yakafanana neyeye sipo paPCB yesimbi simbi yakaputirwa negirizi. Uye zvakare, iko kunetsekana kwepamusoro kunoenderanawo neutsanana uye tembiricha yePCB pamusoro. Chete kana iyo adhesion simba iri rakakura kwazvo kupfuura iyo yepasi simba (kubatana), iyo PCB inogona kuve neakakodzera gaba adhesion.

3, ine tin Angle

Meniscus inoumbwa apo donhwe reshelder rakaiswa pamusoro peinopisa, inoyerera-yakavharwa pcb inenge 35 ° C pamusoro peiyo eutectic poindi yesoder. Kune imwe nhanho, kugona kwesimbi pamusoro pePCB kunamatira tini kunogona kuongororwa nechimiro cheiyo meniscus. Iyo simbi haina kutengeswa kana iyo meniscus iine yakajeka yepasi yakatemwa, inoita kunge madonhwe emvura pane yakazorwa pcb yesimbi ndiro, kana kutomboita kunge yakatenderera. Iyo chete meniscus yakatambanudzwa kune saizi isingasviki makumi matatu. Iyo diki Angle ine yakanaka weldability.

4. Chizvarwa chesimbi alloy makomponi

Iwo mabondmetallic zvisungo zvemhangura netini zvinoumba zviyo zvine chimiro uye saizi zvinoenderana nehurefu uye simba kwetembiricha kwadzinosungirirwa. Kupisa kushoma panguva yekumonera kunogona kuumba yakanakisa kristaro chimiro, izvo zvinoita kuti pcb ifomu ive yakanakisa nzvimbo yekutenderera ine simba rakanakisa. Yakareba nguva yekuita nguva, ingave nekuda kwePBB yekutengesa nguva yakarebesa, yakanyanyisa tembiricha kana zvese zviri zviviri, zvinoguma neyakaomarara crystalline mamiriro ayo ari gravelly uye brittle ane yakaderera sheari simba.Mhangura inoshandiswa seyakagadzika simbi yezvinhu zvePCB, uye tin-lead inoshandiswa seye solder alloy. Mutungamiriri nemhangura hazvingagadzi chero macomputer esimbi, asi tini inogona kupinda mukati memhangura. Iyo yemolemolemendi chisungo pakati petini nemhangura mafomu esimbi alloy macomputer Cu3Sn neCu6Sn5 panosangana nesimbi junction.

Iyo simbi alloy layer (n + ε chikamu) inofanira kunge iri yakatetepa. In pcb Laser nomoto, pakukora simbi chiwanikwa rukoko iri 0.1mm nhamba nhamba. Mune wave soldering uye bhuku rekunamatira, iyo hukobvu hwehukama hwehukama hweakanakisa kutenderera mapoinzi ePCB inopfuura 0.5μm. Nekuti iwo shea simba rePCB welds rinoderera sezvo simbi chiwanikwa rukoko ukobvu hunowedzera, inowanzoyedzwa kuyedza kuchengetedza simbi chiwanikwa rukoko ukobvu pazasi pe1μm nekuchengeta iyo yekutenderera nguva ipfupi sezvinobvira.

Ukobvu hwesimbi alloy rukoko zvinoenderana netembiricha uye nguva yekuumba iyo nzvimbo yekutungidza. Sezvineiwo, iyo simbi inofanirwa kupedzwa munenge ma220 ‘t 2s. Pasi pemamiriro aya, kemikari diffusion reaction yemhangura netini ichagadzira yakakodzera simbi alloy inosunga zvinhu Cu3Sn uye Cu6Sn5 neukobvu hweinenge 0.5μm. Kusakwana kwekubatana kwepakati kwakajairika mumatonho anotonhorera echando kana majoini esolder asina kukwidziridzwa kune tembiricha yakakodzera panguva yemoto uye inogona kutungamira mukuchekwa kwePCB weld pamusoro. Mukupesana, yakanyanya gobvu yesimbi alloy materu, akajairika mune yakanyanyisa kupisa kana akasungwa majoini kwenguva refu, inozoguma mune isina kusimba yakasimba tensile simba rePCB majoini.