Cookies are used on our website. Some of them are mandatory, while others allow us to improve your user experience on our website.
Essential cookies are required for basic website functions. This ensures that the website functions properly.
Name | fe_typo_user |
---|---|
Provider | TYPO3 |
Purpose | This cookie is a standard session cookie of TYPO3. It saves the entered access data for a closed area when a user logs in. |
Cookie life cycle | End of session |
Name | be_typo_user |
---|---|
Provider | TYPO3 |
Purpose | This cookie tells the website whether a visitor is logged into the Typo3 backend and has the rights to manage them. |
Cookie life cycle | End of session |
Name | PHPSESSID |
---|---|
Provider | php |
Purpose | PHP data identifier, set when the PHP session() method is used. |
Cookie life cycle | End of session |
Name | __utma |
---|---|
Provider | |
Purpose | In this cookie the main information is stored to track visitors. In this cookie, a unique visitor ID, the date and time of the first visit, the time at which the active visit is started and the number of all visitors that a unique visitor has made to the website is stored. |
Cookie life cycle | 2 years |
Name | __utmc |
---|---|
Provider | |
Purpose | This cookie belongs to the past and is no longer used by Google Analytics. For the backwards compatibility of pages that still use the urchin.js tracking code, this cookie is still written and expires when the browser is closed. However, this cookie does not need to be considered when debugging and using the new ga.js tracking code. |
Cookie life cycle | Session |
Name | __utmz |
---|---|
Provider | |
Purpose | This cookie is the visitor resource cookie. It contains all visitor resources information of the current visit, also information that was passed on via campaign tracking parameters. This cookie also stores whether the visitor source of the last visit was different from the current one. If no information about the visitor source can be determined, the cookie is not changed. In this way, Google Analytics can associate visitor information such as conversions and e-commerce transactions with a visitor source. The cookie does not contain historical information about past visitor sources. |
Cookie life cycle | 6 months |
Name | _ga |
---|---|
Provider | Google Tag Manager Google |
Purpose | Registers a unique ID that is used to generate statistical data on how the visitor uses the website. |
Cookie life cycle | 2 years |
Name | _gid |
---|---|
Provider | |
Purpose | Used by Google Analytics to limit the request rate. |
Cookie life cycle | 1 day |
Name | _ym_d |
---|---|
Provider | Yandex |
Purpose | Contains the date of the visitor's first visit to the website. |
Cookie life cycle | 1 year |
Name | _ym_isad |
---|---|
Provider | Yandex |
Purpose | Determines whether a user has ad blockers. |
Cookie life cycle | 2 days |
Name | _ym_uid |
---|---|
Provider | Yandex |
Purpose | Used to identify site users. |
Cookie life cycle | 1 year |
M073021 | |
Construction materials, Chemistry, Ceramics / glass industry | |
<150µm | |
d50 < 350nm | |
20g | |
Desired endfineness could be achieved by grinding with our Planetary Micro Mill PULVERISETTE 7 premium line. To be on the save side, we ground longer as necessary. A shortening of grinding times should be possible surely. |
|
Planetary Micro Mill PULVERISETTE 7 premium line |
|
Equipment: |
80 ml grinding bowl made of zirconium oxide (ZrO2) + 100g x 5 mm Ø ZrO2 grinding balls |
|
|
20 g | |
|
<150 µm | |
|
+ 20ml demineralized water | |
|
1 h | |
|
d90<2,8 µm | |
|
With a start size of ~ 150µm, we recommend a pre grinding step with 5mm Ø balls. To avoid overpressure, we ground the sample in steps of 3 minutes, followed by a programmed pausing time of 10 minutes. After several cycles, the outside temperature of the bowl should be checked (remain below 80°C); grinding time or programmed pausing time might be readjusted afterwards. This is counting for all further grinding trials too. After 60min of grinding, fineness has been checked and d50 < 820nm has been detected with our Laser Particle Sizer ANALYSETTE 22 NanoTec (see meas. no. 1297 on separate page). This result is more than fulfilling (probably already 30 min. might be) to change the balls to smaller diameter (e.g. 1,5mm Ø – for this, see result 2).
|
|
Download: | aluoxid.pdf |
|
Planetary Micro Mill PULVERISETTE 7 premium line |
|
Equipment: |
80 ml grinding bowl made of zirconium oxide (ZrO2) + 100g x 1,5 mm Ø ZrO2
|
|
|
~ 20 g (see result 1) | |
|
d50< 820nm (see result 1) | |
|
+7 h (∑ 8 h) | |
|
d50< 881 nm | |
|
After sample has been ground with 5mm Ø balls in result 1, ball diameter has been changed to 1,5mm Ø. After additional 7 hours of grinding, d50 result did not change that much. Especially for particles < 1µm, Mie parameters need to be provided for a proper determination. Particles of > 10µm which has been found in result 1 have been ground. Only particles up to 3µm have been found after totally 8 hours (probably 2 hours might be fulfilling for such a result too). For this, balls might be changed to e.g. 0,5mm Ø directly (without using 1,5mm Ø grinding balls). For this, see result 3.
|
|
Download: | aluoxid_01.pdf |
|
Planetary Micro Mill PULVERISETTE 7 premium line |
|
Equipment: |
80 ml grinding bowl made of zirconium oxide (ZrO2) + 100g x 0,5 mm Ø ZrO2 |
|
|
~ 20 g (see result 2) | |
|
d50< 881nm (see result 2) | |
|
+4 h (∑: 11 h) | |
|
d50 < 307 nm | |
|
In our last trial, balls have been changed from 1,5mm Ø to 0,5mm Ø. By grinding for additional 4 hours (totally 11 hours), a d50 < 307nm has been detected (see meas. no. 1340 on separate page). Because this measurement has been performed without Mie parameters, true value could be much finer. Longer grinding times and a further change of ball diameter are still possible to achieve a better endfineness (compare other grinding results of aluminum oxide).
|
|
Download: | aluoxid_02.pdf |