China's first multi-station high performance surface profiler

Recently, Beijing Jingwei Gaobo Science and Technology Co., Ltd. successfully developed China's first multi-station high performance surface area and micropore physisorption analyzer. “The instrument is an epoch-making product developed based on many technological breakthroughs, and its test function, test accuracy, and test efficiency have all been greatly improved.” said the person in charge of technology at Beijing Fine Micro Technology Co., Ltd.

JW-BF270 Specific Surface and Micropore Physisorption Analyzer

The person in charge of Microfine Technology told the Instrument Information Network (http:/.com.cn/) that the BF series instruments have multiple independent workstations, and that multiple stations can work independently at the same time when testing; there are multiple Dewar flasks and heating systems. The use of flexible and convenient; In addition, the instrument has a number of independent pre-treatment position, vacuum system and test system separate, can be independently pre-processed, program temperature, and has a cold trap to eliminate harmful gases; each workstation has Independent Po pipe detects Po in real time.

"From the scope of the test, the instrument can perform BET surface (single point, multi-point), Langmuir specific surface, external surface determination, BJH (adsorption, desorption) mesopores and macropore pore size analysis, t-plot pores Total pore volume analysis, total pore volume analysis by DR method, HK, FS micropore analysis, CO2 micropore analysis (DFT), adsorption heat measurement, true density measurement, etc.,” said the person in charge of subtle high technology.

Finally, the person in charge of the subtle high-tech technology introduced in detail the key technologies and innovations of the instrument, as follows:

(1) Core structure: Subtle and exclusive use of a unique integrated design, vacuum sealing to achieve the optimal conditions; original temperature correction technology, and real-time monitoring and correction, has played a crucial role in improving the accuracy of instrument testing.

(2) Vacuum system: It adopts imported double-stage rotary vane type mechanical pump, anti-oiling device, and world-class comprehensive performance; it adopts a unique two-stage vacuum molecular pump to meet the test of ultra-micro hole; original vacuum passage, through many The patented technology enables the pumping speed to achieve automatic adjustment of different flow rates; created a special technology for preventing pumping from flying, as well as a series of special vacuum pumping procedures to solve the technical difficulties of ultrafine powder testing.

(3) Control technology: The use of two original pressure points automatic control technology, adsorption high point automatic control technology to ensure the highest scope of the aperture analysis; original low pressure precision control technology to ensure the accuracy of the micro-hole test; test Pressure point interval <0.1KPa, equivalent to more than 1000 points of the adsorption curve test point, reaching the international advanced level; unique pressure point settings, according to the analysis needs to achieve the best combination, test accuracy and test efficiency greatly improved; pressure balance time automatically Judgment and control can be based on the need to optimize the adjustment of the criteria.

(4) Test technology: The accuracy of the pressure sensor is ±0.15% (reading value), which is 25 times higher than the full-scale calibration accuracy in the low pressure area. The multi-range pressure sensor is used in the classification test, and the pressure of different sensors is seamlessly created. Connected proprietary technology; The instrument's dead volume was optimized design, and temperature correction and other series of correction techniques were added to ensure the scientificity and accuracy of the test data; the density input method was successfully developed and the test efficiency was improved.

(5) Po test and correction: Po can be directly measured quickly; high-precision microporous analyzer, with a separate Po tube, aperture measurement process, the simultaneous determination of Po value, but also participate in the calculation in real time.

(6) Pretreatment system: multiple pretreatment positions are set in the main engine, separate vacuum paths are separated from the test system, pretreatment can be performed independently, a cold trap is provided, sample tubes are processed in-situ, and the design of the micro furnace is advanced. Small furnace, low energy consumption, maximum temperature up to 450 °C, safe and reliable, temperature, heating rate, holding time can be automatically controlled, each sample can be individually controlled; with energy saving, security, precision, flexible and convenient features.

(7) Micro-hole test: To achieve precise control and data processing under ultra-low pressure, accurately measure the isothermal adsorption curve in the ultra-low pressure area of ​​micro-holes, and provide reliable analysis basis; to create a micro-mesoporous integration test method With the program, the whole process can be completed in more than ten hours; the minimum pore size of the micropore is less than 0.01nm, which can replace the foreign high-end products; the micropore test with some special conditions, such as the CO2 micropore test, can be completed at the same time. Test and calculation of adsorption heat; precision measurement of true density on the same machine.

(8) Software: The main interface is the only real-time display test system at home and abroad pressure curve with time, intuitively shows the adsorption or desorption process of each pressure point sample, has important value; unique pressure on the test interface Real-time display of temperature, Po, and time; optimal vacuum pumping procedure, automatic pumping speed from 2ml/s to 300ml/s; no liquid nitrogen spatter lifting procedure; automatic conversion of helium and nitrogen, automatic removal of residual gas program.