Changes

Jump to: navigation, search

Edelmetallpulver und -präparate

113 bytes added, 01:31, 19 September 2014
temp edit
Eigenschaften und hoher Temperaturbeständigkeit.
<figure id="fig:Solar cell with print pattern of ARGONOR N920">
[[File:Solar cell with print pattern of ARGONOR N920.jpg|right|thumb|Solar cell with print pattern of ARGONOR Solarzelle bedruckt mit Argonor N920]]
</figure>
</figtable>
=== Conductive Paints and AdhesivesLeitlacke und -klebstoffe===
Conductive paints are precious metal preparations Leitlacke sind i. allg. Edelmetallpräparate in liquid or paste formflüssiger oder pastenartiger Form. They contain the metal filler material, fine silver particles as conductive pigments mostly in flake formSie enthalten den metallischen Füllstoff, a paint compound on artificial resin basisfeinkörniges Silberpulver als leitfähigePigmente mit teilweise plättchenförmiger Struktur, and an organic solvent eine Lackkomponente aufKunstharzbasis und ein organisches Lösungsmittel <xr id="tab:Silver Paints, Conductive Pastes, and Conductive Adhesives"/><!--(Table 8.3)-->. The solvent evaporates during drying in air or by aging at slightly elevated temperaturesBeim Trocknenan Luft oder Altern bei leicht erhöhten Temperaturen verdunstet das Lösungsmittel. This allows the silver particles to connect metallically and form conductive paths Dadurch kommt es zur metallischen Berührung der Pulverteilchen,welche so die Stromleitung ermöglichen <xr id="fig:Flexible keyboard contact pattern printed with AUROMAL 170"/><!--(Fig. 8.3)-->.
Conductive adhesives are used mostly for mechanical bonding with low thermal impactLeitklebstoffe werden vor allem zum wärmearmen Fügen metallischer Teileeingesetzt. As the adhesive components high-polymer organic substances such as epoxy resins and mixed polymers are mostly usedAls Klebstoffe eignen sich hochpolymere, organische Substanzen wie Epoxidharze oder Mischpolymerisate. Durch Beimengung von Füllstoffen,z.B. They are made electrically filler materials such as flake shaped silver powders in Form von plättchenförmigem Silberpulver (70 – - 80 wtMassen-%Ag),werden sie elektrisch leitend. Silver based conductive adhesives are available as single or two component adhesive systemsSilber-Leitklebstoffe kommen sowohl als Einkomponenten-als auch als Zweikomponentenkleber zum Einsatz. Both types are hardening without the application of pressureBeide Klebstofftypenhärten ohne Einwirkung von Druck aus.
<figtable id="tab:Silver Paints, Conductive Pastes, and Conductive Adhesives">
<caption>'''<!--Table 8.3:-->Silver PaintsSilber-Leitlacke, Conductive Pastes, and Conductive Adhesives-Leitpasten und -Leitklebstoffe'''</caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
|-
</figtable>
Conductive paints and adhesives have broad applications Leitlacke und -klebstoffe finden in electrical and electronic engineeringder Elektrotechnik und Elektronik ein breitesAnwendungsfeld. They are used for example for the contacting of film resistors, mounting of terminal wiresSie werden z.B. zur Kontaktierung von Schichtwiderständen, conducting electrostatic electricityBefestigung von Anschlussdrähten, or contacting components at low temperaturesAbleitung elektrostatischer Elektrizität oderzur Kontaktierung von Bauelementen bei niedrigen Temperaturen eingesetzt.
The mechanical strength of the bond connections depends mostly on the selected hardening temperature Die Festigkeit der Klebverbindung hängt dabei von der gewählten Aushärtetemperaturab <xr id="fig:Shear force of an adhesive joint"/> <!--(Fig. 8.4)-->.
<figure id="fig:Flexible keyboard contact pattern printed with AUROMAL 170">
[[File:Flexible keyboard contact pattern printed with AUROMAL 170.jpg|right|thumb|Flexible keyboard contact pattern printed with AUROMAL 170Folientastatur mit AUROMAL170 bedruckt]]
</figure>
<figure id="fig:Shear force of an adhesive joint">
[[File:Shear force of an adhesive joint.jpg|right|thumb|Shear force of an adhesive joint Abscherkraft einer Klebverbindung (silver adhesive Silber-Leitkleber: AUROMAL K 20) as a function of the hardening temperaturein Abhängigkeit von der Aushärtetemperatur]]
</figure>
=== Precious Metal Edelmetall-Flakes===
To obtain certain desired physical properties of preparations the dispersed precious metals in flat flake-like particles (generally called "flakes") are needed. These are produced by milling fine metal powders in the presence of milling additives or agents. The properties of these metal flakes, i.e. silver flakes (ability to disperse easily, flow characteristics, electrical conductivity) are strongly dependent on the particle shape and size as well as on the type of milling agents used. <xr id="fig:SEM photos of silver flakes a fine grain b large flat"/><!--Fig. 8.5--> illustrates through SEM photos a type of rather fine silver flake (medium particle size 4 – 6 µm) (a) and another one with relatively large flat but thin flake shapes (particle size 8 – 11 µm) (b). Typical commercial silver flake types are listed with their respective properties in <xr id="tab:Typical Commercial Silver Flake Types"/><!--(Tab. 8.4)-->. Gold and platinum can also be produced as powder flakes. By volumes used they are however of lesser commercial importance.
<figure id="fig:SEM photos of silver flakes a fine grain b large flat">
[[File:SEM photos of silver flakes a fine grain b large flat.jpg|right|thumb|SEM photos of silver flakes REM-Aufnahmen von Silber-Flakes (a) fine grain feinkörnig (b) large flatgroßflächig]]
</figure>
<figtable id="tab:Typical Commercial Silver Flake Types">
<caption>'''<!--Table 8.4:-->Typical Commercial Silver Flake TypesTypische Handelsformen von Silber-Flakes'''</caption>
{| class="twocolortable" style="text-align: left; font-size: 12px;width:80%"
Retrieved from "https://www.electrical-contacts-wiki.com/index.php?title=Special:MobileDiff/3930"

Navigation menu

Powered by