Platinum pasteAs a precious metal electronic paste, it holds an extremely important position. The following is the discussion on the issue of platinum paste.
Platinum pasteHow to carry out the construction?
What is the sintering temperature for platinum paste? What is the minimum temperature needed to achieve sintering? And what is the maximum temperature that won't cause damage?
What are the various uses of platinum paste?
What issues should be paid attention to during the platinum paste process?
The platinum paste needs to work under high temperatures for a long time. Will there be any problems? What kinds of situations might occur?
What are the common problems that occur during the use of platinum paste?
The platinum paste is a uniform paste-like material formed by mixing pure platinum particles, organic substances and binders. Platinum has extremely stable metallic properties and plays a crucial role in sensor electrodes and high-temperature co-fired components.
In terms of its usage, there are often cases where people are unsure. For instance, the question on this forum "Little Woodworm" is a typical example.
For most application scenarios, the screen printing process is generally used to achieve uniform and clear electrode patterns. Try to avoid the application of the coating method, as the thickness of the film layer is uneven, the lines are not clear, and there are many problems after sintering. In the mild cases, the resistance groups are not uniform, and the film layer has cracks. In severe cases, it will peel off from the substrate and cannot form an ideal conductive layer.
After printing, at a temperature of 150℃, dry for 10 minutes. Increase the temperature at a rate of 5-8℃ per minute, with the peak temperature reaching a minimum of 850℃ for 10 minutes. This is the minimum requirement for the platinum paste to be completely sintered. However, sometimes due to various constraints, it is not allowed to reach such a high temperature. What would happen if the sintering temperature is lower than 850℃? I conducted experiments and found that when sintered to 800℃, the test results showed that it could be metallized, but the resistance was relatively high, and the adhesion was not very reliable. If the requirements are not very high, it can be used勉强 (barely， marginally). Lower the temperature to 750℃ and conduct sintering. After testing， it is basically unusable. In fact， in order to achieve better sintering results， the sintering temperature of 950℃ will result in the best membrane layer performance， with a smaller resistance. Using platinum paste in many cases requires the stability of platinum at high temperatures. Therefore， the platinum paste can be sintered up to 1400-1500℃， and the membrane layer will still be relatively stable. When using， you can choose different sintering temperatures according to your needs. The platinum paste can handle all of them.
The working temperatures of most components range from -20 to +85°C. For more demanding industrial-grade applications, it is -40 to 125°C. The platinum layer remains completely stable within this range and does not undergo any changes. However, some platinum pastes need to work under long-term high temperatures, some even up to around 1000°C. Some users have reported that the test resistance changes over time, typically showing an increase in resistance. Depending on the application environment, we have developed different paste types to meet various requirements.
55H-1805, fired at 850℃, with good cost-performance ratio
55H-1803, after firing at 850℃, the resistance is relatively small
55H-1803D, fired at 1150~1250℃, can meet the requirement of long-term operation within 1000℃.
For other working environments, new models can be developed according to the requirements.
This document was edited and compiled by the process engineer of Shenzhen Saiya Electronic Paste Co., Ltd. Please indicate the source if you wish to forward it.
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