GB2226777A - High pressure cell - Google Patents
High pressure cell Download PDFInfo
- Publication number
- GB2226777A GB2226777A GB8900503A GB8900503A GB2226777A GB 2226777 A GB2226777 A GB 2226777A GB 8900503 A GB8900503 A GB 8900503A GB 8900503 A GB8900503 A GB 8900503A GB 2226777 A GB2226777 A GB 2226777A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- container
- cell
- sample
- heat insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0002—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using variations in ohmic resistance
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Measuring Fluid Pressure (AREA)
Description
1 M&C FOLIO: 230P57957 HIGH-PRESSURE CELL The invention relates to
high-pressure equipmrnt for physico-chemical investigations and for the synthesis of new materials, and more specifically, it deals with high-pressure cells.
Such cells may be used for synthesis on superhard materials to be used in the metal machining.
Such cells may also be successfully used for the investigations of physical properties of solids and liquids within a wide temperature range where it is desirable to determine a change in pressure occurring during synthesis of superhard materials or during examinations of a sample and to control pressure or temperature.
A large number of investigations of physical properties of solids under pressure are carried out nowadays at high temperatures. In this connection, an important scientific trend in high-pressure physics has been the study of polymorphous transformation of solids, the climax of which was synthesis of diamond from graphite and cubic boron nitride from a starting hexagonal form.
2 SU-A-1045 642 discloses a highpressure cell comprising a container for a sample to be examined, a heater and heat insulating envelope positioned coaxially with one another. and a means for measuring pressure inside the container coupled to the container and having a pressure pick-up. The means for measuring pressure inside the container in this cell comprises a capillary tube sealingly communicating with the container and with the pressure pick-up, a hydrostatic fluid being within the container.
However, the provision of the capillary tube in the means for measuring pressure inside the container and the pick-up under a high enough pressure of the hydrostatic fluid, when its viscosity increases, thus lowering the accuracy of pressure measurement. In addition, in measuring a pressure above 4 GPa in this cell the capillary tube may break, so the pressure measurement range is narrow.
What is desired is high-pressure a cell which allows pressure measurement accuracy to be improved and which may enlarge the range of pressure measurement.
The present invention provides a high-pressure cell comprising a container for a sample to be examined or treated, a heater and a heat insulating envelope positioned coaxially with one another, and a means for measuring pressure inside the container coupled to the container and having a pressure pick-up, in which 3 the pressure pick-up of the means for measuring pressure inside the container comprises a resistance pick-up and the means for measuring pressure inside the container is positioned coaxially with the container and also comprises a sealed tube or enclosure containing a hydrostatic fluid. the resistance pick-up being positioned inside the tube.
The means for measuring pressure inside the container for the highpressure cell may additionally contain thermocouple positioned on the resistance pick-up.
The high-pressure cell may also comprise a heat insulating spacer positioned between the bottom of the container and the sealed tube of the means for measuring pressure inside the container, and the heater may be positioned between the container and the heat insulating envelope.
The container of the high-pressure cell may be made with an interior space whose dimensions correspond to the dimensions of the sample.
It is possible to ensure the identical pressure of hydrostatic fluid in both the container and the means for measuring pressure, with high enough pressure values. thus enhancing accuracy of pressure measurement.
In addition, pressure above 4GPa may be measured.
The pressure may be continually changed so as to make it possible to control the pressure value at high 1 4 temperatures.
The fact that it is possible to vary temerature and pressure while retaining accuracy of pressure measurement means that more complete information on the condition of the sample can be obtained, e.g. a phase of diagram can be completely plotted during a single test run.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a general view, in longitudinal section, of a high pressure cell; Figure 2 is a general view, in longitudinal section, of a high pressure cell with an additional thermocouple; Figure 3 is a general view, in longitudinal section, of a high-pressure cell with an additional heat insulating spacer; Figure 4 is a general view, in longitudinal section, of a high pressure cell with a container with an interior space whose dimensions correspond to the dimensions of a sample being examined.
The high-pressure cell shown in Figure 1 comprises a heat insulating envelope 1, a container 2, a heater 3, and a sample 4 coaxially positioned one within another. A thermocouple 5 is mounted on the sample 4. Current leads 6 and 7 connected to a power supply (not shown) are coupled to the heater 3. The current lead 6 extends z f through a lid 8 of the container 2. A device 10 for measuring pressure inside the container is positioned under the bottom 9 of the container 2. The device 10 comprises a sealed tube 11, having a lid 12, and a resistance pick-up 13 positioned within the tube in a hydrostatic fluid.
In another embodiment of the high-pressure cell, shown in Figure 2, the device 10 for measuring pressure inside the container also comprises a thermocouple 14 positioned on the resistance pick-up 13.
In still another embodiment. shown in Figure 3, the high pressure-cell also comprises a heat insulating spacer 15 positioned between the bottom 9 of the container 2 and the sealed tube 11 of the device 10 for measuring pressure inside the container. The heater 3 is positioned between the container 2 and the heat insulating envelope 1.
And finally, in a further embodiment of the high-pressure cell, shown in Figure 4. a container 16 having a lid 17 is made with an interior space 18 whose dimensions correspond to the dimensions of the sample 4 being examined, e.g. a flowable sample as shown.
The high-pressure cell functions in the following manner.
A pressure increase inside a high-pressure apparatus (not shown) results in a pressure inside the container 2 (Figure 1) of the high-pressure cell, which is filled 1 6 with a liquid or gas, and inside the sealed tube 11 of the device 10 for measuring pressure inside the container, which is filled with liquid. Build up of pressure in the high-pressure cell is recorded by its resistance pickup 13. After the pressure build-up, electric current is caused to flow in a circuit formed by the current lead 6, heater 3, and current lead 7. The heater 3 heats the sample 4 being examined. The temperature of the sample 4 is measured by means of the thermocouple 5. An increase in temperature of the sample 4 results in an increase in pressure in the container 2, which causes an increase in pressure in the sealed tube 11. This pressure increase is recorded by the resistance pickup 13.
The temperature of the resistance pick-up 13 is much lower than temperature of the heated sample 4 as the liquid surrounding the sample 4 has a low heat conductance. In addition, the tube 11 had good thermal contact with massive metal parts of the high-pressure apparatus (not shown). Consequently, the resistance pick-up 13. which is positioned inside the-tube 11, cannot be substantially heated. This facility allows temperature influence on readings of the pick-up to be eliminated. However, the temperature of the pick-up 13 may be monitored by means of the thermocouple 14 (Figure 2).
With a strong enough heating of the sample 4, the Z11 7 heat insulating spacer 15 is used to limit heating of the pick-up 13 (Figure 3). Arranging the heater 3 between the container 2 and heat insulating envelope 1 simplifies assembly and facilitates conduct of a test run.
In a case when non-hydrostatic pressure can act upon the sample 4, use is made of the container 16 (Figure 4) having the lid 17 and the interior space 18 whose dimensions correspond to the dimensions of the sample 4 being examined. The medium transmitting pressure to the sample 4 in this case is the material of the container 16.
When predetermined temperature and pressure are achieved in the sample 4 (Figures 1 to 4), its properties are changed, e.g. a phase transition occurs with a decrease in volume. Pressure in the sample 4 thus drops, and this pressure change is transmitted to the liquid in the sealed tube 11. This pressure drop is recorded by the pick-up 13. If it is necessary to restore previous conditions of temeperature and pressure in the sample 4, pressure acting upon the high-pressure cell is changed by varying the force of a press (not shown). Temperature of the sample 4 is also changed by changing power of electric current flowing in the-heater 3.
Therefore, the high-pressure cell allows continual measurement of pressure acting upon the sample 4 to be 1 8 carried out, for maintaining a preset constant pressure at a pre-set temperature.
The cell also enhances safety in working with highpressure equipment.
Finally, the high-pressure cell can be used in various types of highpressure apparatuses.
1 (1 1 1
Claims (6)
- CLAIMS:9 1 A high-pressure cell comprising a container for accommodating a sample to be examined or treated, a heater and a heat insulating envelope positioned one inside another, and means for measuring pressure inside the container, aligned with the container and comprising a sealed enclosure containing a hydrostatic fluid and a resistance pick-up inside the tube.
- 2 A cell as claimed in claim 1, wherein the pressure measuring means includes a thermocouple on the resistance pick-up.
- A cell as claimed in claim I or 2, including a heat insulating spacer positioned between the container and the sealed enclosure.
- 4 A cell as claimed in any preceding claim, wherein the heater is positioned between the container and the heat insulating envelope.
- A cell as claimed in claim 4, wherein, in use, the dimensions of the interior space of the container correspond to the dimensions of the sample.
- 6 A high-pressure cell substantially as described with reference to, and as shown in any of Figures 1 to 4 of the accompanying drawings.Published 1990 at The Patent Office, State House. 6671 High Holborn, London WC1R4TP. Further copies maybe obtained from The PatentOffice
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883843604 DE3843604A1 (en) | 1988-12-23 | 1988-12-23 | HIGH PRESSURE CELL |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8900503D0 GB8900503D0 (en) | 1989-03-08 |
GB2226777A true GB2226777A (en) | 1990-07-11 |
Family
ID=6370083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8900503A Withdrawn GB2226777A (en) | 1988-12-23 | 1989-01-10 | High pressure cell |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3843604A1 (en) |
FR (1) | FR2641614A1 (en) |
GB (1) | GB2226777A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5213029A (en) * | 1991-03-28 | 1993-05-25 | Kabushiki Kaisha Kobe Seiko Sho | Apparatus for treating food under high pressure |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI299744B (en) * | 2001-06-22 | 2008-08-11 | Fuji Corp | Phthalocyanine compound, ink, ink for ink-jet recording, ink-jet recording method and method for improving resistance of color-imaging material to ozone gas |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1229797A (en) * | 1967-09-08 | 1971-04-28 | ||
SU1045642A1 (en) * | 1982-03-17 | 1985-08-23 | Институт экспериментальной минералогии АН СССР | High-pressure and high-temperature apparatus |
DE3440568A1 (en) * | 1984-11-07 | 1986-05-15 | Robert Bosch Gmbh, 7000 Stuttgart | HIGH PRESSURE SENSOR |
-
1988
- 1988-12-23 DE DE19883843604 patent/DE3843604A1/en not_active Withdrawn
-
1989
- 1989-01-06 FR FR8900124A patent/FR2641614A1/en not_active Withdrawn
- 1989-01-10 GB GB8900503A patent/GB2226777A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5213029A (en) * | 1991-03-28 | 1993-05-25 | Kabushiki Kaisha Kobe Seiko Sho | Apparatus for treating food under high pressure |
Also Published As
Publication number | Publication date |
---|---|
FR2641614A1 (en) | 1990-07-13 |
GB8900503D0 (en) | 1989-03-08 |
DE3843604A1 (en) | 1990-06-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |