1 Introduction
2 State of the art and theoretical background
2.1 Support structures for MJT
2.2 Wettability and contact angle
3 Materials and methods
3.1 Sample description
3.1.1 Preselection salts
Salt/salt mixture | Melting temperature | Note |
---|---|---|
NaCl | \({801}\;^{\circ }{\hbox {C}}\) [11] | Purity: p.a.* |
KCl-NaCl | \({658}\;^{\circ }{\hbox {C}}\) [13] | Eutectic mixture, components with purity: p.a.* |
NaCl-\({\hbox {Na}_{2}\hbox {CO}_{3}}\) | \({634}\;^{\circ }{\hbox {C}}\) [14] | Eutectic mixture, components with purity: p.a.* |
3.1.2 Preselection nozzle materials
Material | Abbr. | Trade name, manufacturer |
---|---|---|
Aluminium oxide | AO | LithaLox HP350D, Lithoz GmbH, Vienna, Austria |
Machinable aluminium nitride ceramic | AN | SHAPAL\(^{\tiny{\hbox {TM}}}\) HI M-SOFT, Tokuyama co., Tokyo, Japan |
Isostatic, machinable graphite | GR | R7340, Final Advanced Materials GmbH, Freiburg, Germany |
Mica glass ceramic | GC | Vitronit\(^\circledR\), VITRON Spezialwerkstoffe GmbH, Jena-Maua, Germany |
Silicon nitride | SN | SN-HP, FCT Ingenieurkeramik GmbH, Frankenblick, Germany |
Zirconium dioxide | ZO | StarCeram\(^\circledR\) Z-Smile Pure, KYOCERA Fineceramics Precision GmbH, Selb, Germany |
\(Rz_\mathrm{mean}\) | \(Rz_\mathrm{max}\) | \(Rz_\mathrm{min}\) | \(Rz_\mathrm{sd}\) | |
---|---|---|---|---|
AO | 11,1 | 15,4 | 8,7 | 1,7 |
AN | 11,7 | 13,2 | 9,5 | 1,0 |
GR | 11,7 | 23,8 | 9,1 | 2,9 |
GC | 22,2 | 33,4 | 14,0 | 5,9 |
SN | 15,1 | 18,6 | 12,3 | 1,5 |
ZO | 7,9 | 10,3 | 6,3 | 1,1 |
3.2 Experimental setup
3.2.1 Test stand for MJT
3.2.2 Contact angle test stand
3.3 Experimental procedure for determining the contact angle
4 Results and discussion
4.1 Contact angle measurements
NaCl | KCl–NaCl | NaCl–\({\hbox {Na}_{2}\hbox {CO}_{3}}\) | |
---|---|---|---|
AO | 5/6 | 10/10 | <5 |
AN | 63* | 43/57 | 17/19 |
GR | 19/24 | 75/87 | 13/15 |
GC | <5 | <5 | 17/17 |
SN | <5 | 23/26 | 11/12 |
ZO | < 5 | <5 | <5 |
4.2 Trial in MJT test stand
NaCl | KCl–NaCl | NaCl–\({\hbox {Na}_{2}\hbox {CO}_{3}}\) | |
---|---|---|---|
AO | |||
AN | x | x | |
GR | x | ||
GC | |||
SN | x | ||
ZO | x | x |