mihm-vogt HT-S 2 High Temperature Sintering Furnaces Instruction Manual
- September 29, 2024
- mihm-vogt
Table of Contents
HT-S 2 High Temperature Sintering Furnaces
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Specifications:
- Manufacturer: MIHM-VOGT GmbH & Co. KG
- Model: Sintering Furnaces
- Location: 76297 Stutensee
Product Information:
1. General Information:
The supplemental information provided here is to assist in the
maintenance and smooth operation of MIHM-VOGT sintering furnaces.
It is important to strictly follow the operating instructions.
2. Heating Chambers:
2.1. Manual Cleaning of the Heating Chambers:
The heating chambers or sintering plating should be cleaned
using a soft brush. Avoid using compressed air for cleaning.
2.2. Cleaning the Heating Chambers by Means of a Cleaning
Firing:
Chemical residues can be reduced by running a cleaning program
multiple times. Specific programs can be accessed based on the
device type and serial number.
2.3. Cleaning Cycle of the Heating Chambers:
Cleaning cycles should be performed weekly or monthly depending
on the usage to maintain the heating chambers.
3. Heating Elements:
3.1. Checking MoSi Heating Elements:
Visual inspection of MoSi heating elements is necessary before
each sintering process to ensure they are intact and free from
chemical contamination.
3.2. Regeneration Firing of MoSi Heating Elements:
Regeneration firing can be done following specific instructions
based on the device’s serial number to maintain the heating
elements.
FAQ:
Q: How often should I clean the heating chambers?
A: The heating chambers should be cleaned weekly or monthly,
depending on your usage.
Q: What should I avoid when cleaning the heating chambers?
A: Do not use compressed air for cleaning; instead, use a soft
brush.
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Maintenance of MIHM-VOGT Sintering Furnaces
MIHM-VOGT GmbH & Co. KG, 76297 Stutensee
Contents
1. General information
3
2. Heating chambers
3
2.1. Manual cleaning of the heating chambers
3
2.2. Cleaning the heating chambers by means of a cleaning firing
4
2.3. Cleaning cycle of the heating chambers
4
3. Heating elements
5
3.1. Checking MoSi heating elements
5
3.2. Regeneration firing of MoSi heating elements
6
3.3. Regeneration cycle of MoSi heating elements
7
3.4. Checking SiC heating elements
7
4. Installing sintering furnaces
8
4.1. Dust prevention
8
4.2. Acidic ambient air
9
5. Pre-drying of zirconium oxide
9
6. Additional maintenance tasks
9
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Service and maintenance of MIHM-VOGT sintering furnaces
V1.0
1. General information
The following information presents supplemental information to the operating
instructions for MIHM-VOGT sintering furnaces. The contents of the operating
instructions must be strictly observed. This supplemental information is
intended to help ensure the smooth operation of MIHM-VOGT sintering furnaces.
2. Heating chambers
The heating chambers of MIHM-VOGT sintering furnaces are comprised of two
high-quality insulating layers. The following information is intended to help
ensure that MIHM-VOGT sintering furnaces have a long service life. A visual
inspection of the heating chambers should be performed prior to each sintering
process. Foreign particles and accumulations of dirt can affect the sintering
results. Dust and foreign particles must be removed by means of manual
cleaning, while chemical contamination (e.g. as a result of colouring liquids)
can be eliminated by a cleaning firing.
2.1. Manual cleaning of the heating chambers
The heating chambers or sintering plating (see Fig. 1 or Fig. 2) must be
cleaned using a soft brush. Under no circumstances should compressed air be
used to clean the heating chambers!
Fig. 1
Fig. 2
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Service and maintenance of MIHM-VOGT sintering furnaces
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2.2. Cleaning the heating chambers by means of a cleaning firing
Chemical residues, for example from zirconium oxide, can be reduced using a
cleaning program. If necessary, the cleaning program should be run multiple
times. In the case of devices with a 6-digit serial number, the cleaning
program can be accessed as follows:
Type of device:
Program
TABEO-1/M/ZIRKON-100
C
TABEO-1/S/ZIRKON-100
C
TABEO-2/M/ZIRKON-120
C
TABEO-2/S/ZIRKON-120
C
HTS-2/M/ZIRKON-120
32
HT-2/M/ZIRKON-120
32
Tab. 1
In the case of devices with a 5-digit serial number, the cleaning program can be programmed as follows:
Heating rate Temperature Holding time
°C/min.
°C
min.
TLevel 4
25
a
bLevel 3
25
.
Level 2
25
2
Level 1
25
300
0
1500
120
0
0
0
0
Tab. 2 2.3. Cleaning cycle of the heating chambers
The wear of materials in the heating chambers of MIHM-VOGT sintering furnaces depends substantially on the individual use. The cleaning cycles described below should therefore simply serve as a suggestion.
Service and maintenance of MIHM-VOGT sintering furnaces
V1.0
What?
Cleaning the heating chamber with a brush
Cleaning the heating chamber using a cleaning program
Tab. 3
When? weekly monthly
3. Heating elements
Mihm-Vogt sintering furnaces are equipped either with MoSi heating elements
(Fig. 3) or with SiC heating elements (Fig. 4). Furnaces equipped with MoSi
heating elements can be heated to 1650 °C; furnaces with SiC heating elements
can be heated to a maximum of 1550 °C.
Fig. 3
Fig. 4
3.1. Checking MoSi heating elements
A visual inspection of the heating elements should be performed prior to each
sintering process. MoSi heating elements are protected against outgassing by a
glaze-like oxide layer. However, chemical contamination (e.g. by colouring
liquids) can destroy the protective oxide layer on the heating elements, and
spalling may occur on the surface (Fig. 5).
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Service and maintenance of MIHM-VOGT sintering furnaces
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3.2. Regeneration firing of MoSi heating elements
A regeneration firing can be used to attempt to restore the protective oxide
layer on the MoSi heating elements. The furnace must be empty when it is
heated during the regeneration firing i.e. without sintering support
structures or sintering aids. The protective coating on the heating elements
must be examined after the firing. If the surface does not have a glaze-like
coating (see Fig. 6), the regeneration firing must be repeated.
Page 6
Fig. 5
Fig. 6
In the case of devices with a 6-digit serial number, the regeneration firing can be accessed as follows:
Type of device: TABEO-1/M/ZIRKON-100 TABEO-2/M/ZIRKON-120 HTS-2/M/ZIRKON-120
HT-2/M/ZIRKON-120
Tab. 4
Program E E 33 33
Service and maintenance of MIHM-VOGT sintering furnaces
V1.0
In the case of devices with a 5-digit serial number, the regeneration firing can be programmed as follows:
Serial number is lower than 50703:
Heating rate Temperature Holding time
°C/min.
°C
min.
Level 4
25
300
0
Level 3
25
1550
120
Level 2
25
1550
180
Level 1
25
Tab. 5
1550
180
3.3. Regeneration cycle of MoSi heating elements
Wear in MoSi heating elements in MIHM-VOGT sintering furnaces depends
substantially on the individual use. The cycles described below should
therefore simply serve as a suggestion.
What?
When?
Checking the heating elements
monthly
Regeneration of the heating elements with the aid of regeneration programs
Tab. 6
monthly
3.4. Checking SiC heating elements
A visual inspection of the heating elements should be performed prior to each
sintering process. Unlike MoSi heating elements, SiC heating elements do not
have an oxide layer. In particular in the case of the first sintering
processes, blistering may occur on the surface of these heating elements. This
blistering is not critical and can be ignored.
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When SiC heating elements approach the end of their service life, there is a
significant reduction in their heating capacity. As a rule, SiC heating
elements can only be replaced as a complete set.
4. Installing sintering furnaces
When installing MIHM-VOGT sintering furnaces, the conditions in the operating
manual must be observed. The following presents supplementary information.
4.1. Dust prevention
Excessive dust exposure can damage the sintering furnaces and thus
substantially shorten the service life of the device. Dust must therefore be
avoided as much as possible (for examples if an excessive load, see Fig. 7 and
Fig. 8). Excessive dust exposure may be caused by zirconium oxide milling
machines with insufficient extraction. If zirconium oxide milling machines are
set up in the immediate vicinity of sintering furnaces, care should be taken
to ensure that these devices have adequate extraction. Otherwise, zirconium
oxide sintering furnaces should be set up in separate rooms that are not
exposed to dust.
Fig. 7
Fig. 8
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Service and maintenance of MIHM-VOGT sintering furnaces
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4.2. Acidic ambient air
Acidic ambient air can cause damage, especially to the electronic components
in a sintering furnace (for examples, see Fig. 9 and Fig. 10) and therefore
should be avoided. Acidic ambient air may arise due to the use of acidic
colouring liquids. Such colouring liquids should therefore be used outside of
the room in which the sintering furnaces are installed whenever possible. Care
should also be taken to ensure that the sintering furnaces are only loaded
with well-dried zirconium oxide restorations.
Fig. 9
Fig. 10
5. Pre-drying of zirconium oxide
Moisture can damage MIHM-VOGT sintering furnaces. It can be introduced into
the furnace, for example, by colouring liquids or even by wet-grinding milling
machines, for example. It is therefore recommended that restorations
undergoing sintering are dried in an external furnace.
6. Additional maintenance tasks
The need to carry out maintenance work largely depends on the individual
frequency of use of the furnace. The intervals shown below are therefore to be
considered as approximate values only.
V1.0
Service and maintenance of MIHM-VOGT sintering furnaces
Page 9
What?
When?
Cleaning the housing
as needed
Cleaning the heating chamber with a brush
weekly
Cleaning the heating chamber using a cleaning program
monthly
Inspecting the surface of the heating element and performing a regeneration firing
monthly
Checking the temperature Tab. 7
annually
How?
with a dry cloth
See the instructions above
See the instructions above
See the instructions above
using a MIHM-VOGT test kit
MIHM-VOGT GmbH & Co. KG Friedrich-List-Str. 8
76297 Stutensee-Blankenloch 07244-70871-0www.MIHM-VOGT.de
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Service and maintenance of MIHM-VOGT sintering furnaces
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