Application of IKN MP100 vacuum emulsifier in the field of electronic slurry research and development

Electronic paste is a key material for the manufacture of functional electrodes or thick film circuits for electronic components. It disperses various functional powders into one body by an organic carrier, and then forms a conductor, a resistor, an insulator or a capacitor on a semiconductor substrate or other substrate. The IK N vacuum emulsifier is applied to the preparation of organic carriers, and helps to achieve the best process through the regulation of parameters such as temperature, rotation speed and vacuum.

Introduction of electronic paste :

Electronic paste is a key material for the manufacture of functional electrodes or thick film circuits for electronic components. It disperses various functional powders into one body by an organic carrier, and then forms a conductor, a resistor, an insulator or a capacitor on a semiconductor substrate or other substrate. As a paste with a certain rheology and thixotropic properties, electronic paste is derived from the traditional ceramics and coatings industries.

Electronic pastes are used in a wide range of applications, the most common of which are solar cells. The rational design of the solar cell structure, the epitaxial growth of the solar cell material and the post-process of the cell in the whole solar cell manufacturing process are the three most basic steps in the fabrication of the solar cell.

The screen printing and firing process of the positive and back electrodes of solar cells is the last step in the fabrication of solar cells, and silver electronic paste is one of the key materials required for the fabrication of solar cells. Taking silver electronic paste as an example. It is mainly composed of three major parts:

         

An ultrafine metal silver powder that conducts electricity, an inorganic phase ( glass powder ) that cures and fuses after heat treatment , and an organic phase ( organic carrier ) that acts as a binder at low temperatures .

The importance of electronic slurry organic carriers :

The function of the organic vehicle is to disperse a mixture of a solid metal form of a silver metal functional phase, an inorganic glass phase and other functional solid ultrafine particles into a slurry having fluid properties for transfer onto a silicon substrate to form a desired pattern. In other words, the organic vehicle mixes and disperses the metal powder and the glass powder for bonding and other solid powder into a paste slurry. The organic vehicle usually consists of a solvent ( volatile component ) , a thickener ( nonvolatile component ) , a fluidity controlling agent, a surfactant, and the like, and each component may be composed of one or several materials.

In particular, electronic slabs are required to have good thixotropy, and the development of organic carriers is particularly important. The composition, content, and volatilization characteristics of the organic carrier have a direct impact on the performance of the slurry.

Several key points in the preparation of organic carriers :

(1) uniformity of the organic carrier paste, bubbles, degree of dispersion, etc.;

(2) The volatility of the solvent in the organic vehicle to minimize the evaporation of the solvent;

(3), the organic vehicle component needs to be dissolved at a certain temperature (typically 80? C or so), but also to maintain stirring.

Introduction of IK N vacuum emulsifier :

IK N offers a complete solution from 5mL to 2000L reaction system including: agitation, homogenization, heating, pH measurement, vacuum, torque measurement ( viscosity ) and software acquisition data.

(1) , homogenization: IK N reactor can be equipped with ER2000 emulsifier , through the selection of suitable dispersing tools, to obtain different sizes of particles, the minimum can reach 0.3 μ m ;

(2) , stirring: IK N is equipped with a scraping mixer, the maximum processing viscosity can reach 150,000 mPas , and can be operated regularly, TFT large digital display;

(3) Heating: The jacketed reactor of IK N allows an external constant temperature circulator to heat or even cool the sample. If the thermostat is connected to an external temperature sensor, real-time monitoring of the sample temperature is possible;

(4) Torque measurement ( viscosity ) : The P4 equipped with IK N allows the viscosity change of the material to be monitored during material handling. The illustration shows a process in which a sample is heated in a reactor and then cooled.

(5) Vacuum: Removing bubbles from the product is a very difficult and time consuming task. The vacuum environment and slow agitation can minimize or even avoid the influence of gas on the sample. IK N scraping with stirring i.e. the maximum speed of 530rpm, the minimum is only 4 rpm; the lowest LVS105T pump vacuum up to 2 mbar, while the ball bearing and the vacuum tank lid dispersing machine ensures low vacuum value.

(6) Flexibility: In addition to the above performance, the IK N reactor lid is equipped with standard NS29 and NS14 interfaces to meet the needs of applications such as pH measurement, reflux condensation, and feed devices.

(7) , data collection: In fact, in order to ensure the reproducibility of the process, data recording and simulation will become more important. The above mentioned speed, temperature, pH , vacuum, etc. can be collected by I software to store, display and export excel data.