After the six electric furnaces began to work, Inogu Jifu walked to the first electric furnace in a hurry, and carefully observed the changes in the green state of the porcelain support shaft device in the furnace through the observation window. A few minutes later, he moved to the next electric furnace to observe the green inside.

In this way, it took more than 20 minutes before and after, and he observed the sintering state of the green billets in the six electric furnaces, and then nodded and said to Geng Xiaofang: "Director Geng, the temperature control of these six resistance furnaces is still unsatisfactory, especially the overshoot of the set temperature is a bit large, and after the temperature callback, the fluctuation range of accurate constant temperature maintenance has reached the range of plus or minus five degrees. ”

The so-called overshoot of the set temperature refers to the fact that after the temperature in the sintering furnace of the resistance furnace reaches the set temperature, a certain degree of overshoot is often required. For example, if the set temperature is 500 degrees Celsius, then when the furnace temperature reaches 500 degrees Celsius, it will continue to rise to about 510 degrees Celsius to 520 degrees Celsius, and the higher ten degrees Celsius and 20 degrees Celsius are called overshoot.

When the temperature in the sintering furnace reaches the overimpulse, it will slowly pull back to the pre-set working temperature, and then change the positive and negative temperature around the set working temperature. This positive and negative temperature change is known as the fluctuation range for precise thermostatic maintenance.

Geng Xiaofang didn't seem to understand the professional terms that Jifu said about Zhu Stocks, but the general meaning could still be understood, he couldn't help but feel a tightening heart, and hurriedly asked: "Professor Zhu Stocks, are these six resistance furnaces unqualified and cannot be used?"

Sun Guishan also looked at the pig stock Jifu with a nervous face.

"You don't need to change it, and besides, didn't Director Sun also say just now, these six resistance furnaces are the most advanced industrial electric furnaces in your Huaxia country, unless it is said that there are imported electric furnaces with better performance in your Tianzhong area, what electric furnaces can be replaced with, right?" Although the accuracy of the six electric furnaces is a little worse, the test margin left by my pre-sintering is still relatively wide, and the fluctuation value is still within the design tolerance, which is why I have to place nine support shaft green billets in different positions in the sintering furnace of each electric furnace. ”

Geng Xiaofang and Sun Guishan breathed a sigh of relief, Professor Zhu Gu Jifu is worthy of being an authoritative expert in the neon country, when designing the experimental plan, the influence of the performance of the electric furnace on the experimental results has been considered, and the defect of the temperature control of the resistance furnace is not accurate and precise enough by increasing the number of experimental samples.

"Okay," Pig Stocky Jifu clapped his hands lightly and said with a smile: "I think you must have a lot of questions in your mind about this pre-burning plan I arranged, right? ”

There was a sound of surprise at the scene.

Including Sun Guishan, I thought that Pig Shares would be able to tell them the operating procedures of the secondary sintering, and it would be very good to lead them to sinter a qualified porcelain support shaft device, but I didn't expect that Pig Stocks would answer questions on the spot and tell them all the principles involved.

He is really worthy of being an authoritative expert in the neon country, what a high wind and bright festival this is!

"Professor Zhu Stock, let me ask a question first!" Sun Guishan was afraid that other people would be thin-skinned and did not dare to speak to the neon experts, so he decided to throw bricks and lead the way, "I would like to ask, why did you only choose the three temperature indicators of 500 degrees Celsius, 700 degrees Celsius and 800 degrees Celsius when you designed the pre-firing scheme, and the pre-firing time was set at five hours and ten hours?"

"Director Sun, your question is very critical!" Zhu Gu Jifu first praised Sun Guishan, and then replied: "Because according to our research experience, the heat treatment of the ceramic body below 300 degrees Celsius basically belongs to the drying stage, which is the continuation of the drying treatment, and the main component of our pre-sintered porcelain support shaft device this time is alumina. In the pre-firing process of more than two hours and the working temperature of more than 1,000 degrees Celsius, the size of the alumina body will shrink by 0.4%, which will have a greater impact on the second sintering. Therefore, the maximum working temperature of pre-sintering should not exceed 800 degrees Celsius. ”

"In addition, the working time of pre-sintering also has different effects on the tensile and compressive strength of the green body, according to my experience accumulated in pre-sintering for many years, the strength of the alumina green billet will change significantly after five hours and ten hours under the agreed pre-sintering temperature, and below five hours, or more than ten hours, this change is very slow and not obvious. ”

"Considering that your factory only has six resistance furnaces, in terms of experimental efficiency, it is the most economical and effective to omit other pre-firing time and only set two pre-firing time periods of five hours and ten hours. ”

Except for Hao Shuang and Yang Guanghui, everyone at the scene looked up at the pig stock Jifu from a 45-degree upward perspective. These things are easy to say, but they can't be mastered without countless experiments and repeated trial and error.

But Professor Inogu Yoshifu stood here, calmly and lightly teaching them the valuable experience he had gained in countless experiments. Regardless of the technical level of Professor Pig Geev, this character alone is enough to be crowned with the title of contemporary Bethune!

Hao Shuang is a master of technology in the previous life, and he doesn't know how many pigs he can beat with experience and insight, and he naturally scoffs at the superficial knowledge that the college students majoring in ceramics in the previous life and his class can basically master.

Yang Guanghui did not look up at Zhu Gu Jifu, because he really couldn't take care of it, as the technical secretary of the project team, he was holding a notebook, brushing and using shorthand symbols to faithfully record every word that Professor Zhu Gu Jifu said.

Seeing that Pig Stock Jifu had all questions and answers to Sun Guishan, the rest of the project team became bold and raised their own questions to Zhu Stock Jifu about the pre-sintering process.

Like Grandpa Sun Jingxiu, who told stories to children on the radio, Pig Shares Jifu patiently gave very detailed answers to the questions raised by all the members of the project team, which made everyone in the project team feel that they had benefited a lot.

This scene went on until half past ten in the morning, and when Pig Shares Jifu looked around the scene and saw that no one asked any more questions, he turned his head and said to Geng Xiaofang, who was standing aside: "Director Geng, the results of this pre-sintered group of samples will come out after two o'clock in the afternoon, and now I have finished answering all the questions on the project team." Then the rest of the time, you see......"

What's next?

Geng Xiaofang suddenly reacted, didn't Shi Yicheng report on the phone that Professor Zhu Gu was very interested in the firing of imitation Ru kiln azure glaze? Why don't you take this time to take Zhu Gu Jifu to visit the art ceramics workshop of the Special Pottery Factory?

Thinking of this, Geng Xiaofang said: "Professor Pig Bone, or I and Director Sun will accompany you to the Meitu Ceramics Workshop......

As soon as he said this, he suddenly heard a voice from the corner of the scene, "Professor Pig Bone, I think you are optimistic! Your secondary sintering process actually cannot solve the problem of firing porcelain support shaft device at low temperature currently encountered by the project team of the special pottery factory!"