JPH0527609U - Deiratometer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a dilatometer having a compact structure with high space utilization efficiency. An outer tube (13) having a closed end (14) at one end and an inner member (15) slidable in the longitudinal direction inside the outer tube (13) are provided, and one end of the inner member (15) and the closed end (14) of the outer tube (13). Between the specimen
20, the inner member 15 is placed so that one end of the inner member 15 contacts the closed end 14 of the outer pipe 13 via the specimen 20.
A spring 22 for biasing the closed end 14 side of the outer tube 13 is provided.
Displacement sensor for detecting relative axial displacement between the inner member 15 and the inner member 15
23 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dilatometer which measures elongation and shrinkage of a material under high temperature and is used for, for example, research on a sintering process.

[0002]

[Prior Art]

 As shown in FIG. 3, a conventional dilatometer includes a cylindrical outer tube 1 made of graphite, a rod 2 slidably mounted in the outer tube 1 in the longitudinal direction, and an upper end portion of the rod 2. Connect the yoke 3 made of graphite, the adjusting screw 4 screwed to the yoke 3, the plunger 5 provided at the lower end of the rod 2, and the coil 6 fixedly attached to the lower end of the outer tube 1. The displacement gauge 7 is provided, and the specimen 8 is sandwiched between the adjusting screw 4 and the closed end 1a of the outer tube 1. Then, due to the expansion or contraction of the specimen 8, the yoke 3 and the rod 2 move relative to the outer tube 1 in the longitudinal direction, and the relative displacement amount is calculated by the displacement gauge 7 from the displacement of the capacitance or the like. It is configured to detect.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, the adjusting screw 4 is required, the yoke 3 is larger than the outer tube 1, and the yoke 3 needs to be provided with the female screw 9 for screwing the adjusting screw 4 into the outer pipe 1. The structure of the loading part of the dilatometer 8 specimen was complicated and large. For this reason, there is still a problem in space utilization efficiency for a hot isostatic pressurizer (HIP) operated under high pressure, although it is still for a normal pressure furnace that has a dimensional allowance.

In view of the above problems, the present invention aims to provide a dilatometer having a high space utilization efficiency, that is, a compact structure.

[0005]

[Means for Solving the Problems] The technical means of the present invention for solving this technical problem is an outer tube 13 having a closed end 14 at one end, and a longitudinal slidable inside the outer tube 13. And an inner member 15 provided on the outer tube, and a test piece 20 is interposed between one end of the inner member 15 and the closed end 14 of the outer tube 13, and one end of the inner member 15 is connected to the outer tube via the test piece 20. A spring 22 for urging the inner member 15 toward the closed end 14 side of the outer pipe 13 is provided so as to abut the closed end 14 of the outer pipe 13, and the relative displacement in the axial direction between the outer pipe 13 and the inner member 15 is provided. The point is that a displacement gauge 23 for detecting the amount is provided.

[0006]

[Action]

 The expansion or contraction of the sample 20 causes the inner member 15 to move in the longitudinal direction with respect to the outer tube 13. Then, the displacement meter 23 detects the expansion or contraction of the sample 20 as the displacement of the inner member 15 with respect to the outer tube 13.

[0007]

【Example】

 1 and 2, reference numeral 13 denotes a cylindrical outer tube having a closed end 14, and 15 denotes a cylindrical inner member having a closed end 16. Reference numerals 18 and 19 denote spacers for maintaining the concentricity between the outer tube 13 and the inner member 15. One spacer 18 is provided at the tip of the inner member 15 on the closed end 14 side, and the other spacer 19 is the inner member 15. It is provided on the open end side of. Reference numeral 20 is a sample whose elongation or contraction is to be measured, and is interposed between the closed end 14 of the outer tube 13 and the closed end 16 of the inner member 15.

The opening end side of the outer tube 13 is fixed to a holder 21, and the holder 21 is provided with a spring 22. The spring 22 biases the inner member 15 toward the closed end 14 side of the outer tube 13 via the spacer 19. Further, a displacement meter 23 (an electrostatic capacitance type is shown in the figure) is fixed to the holder 21, and the expansion or contraction of the sample 20 is used as the displacement amount of the inner member 15 with respect to the outer tube 13. That is, the displacement amount of the spacer 19 is detected.

An opening 25 is provided on the side surface near the closed end 14 of the outer tube 13, and an opening 26 is also provided in the spacer 18 corresponding to the opening 25. 26 makes it easy to set the specimen 20, and facilitates communication between the atmosphere in which the dilatometer is placed and the inside of the outer tube 13. Further, the spacer 18 is provided with a projecting piece 27 projecting from the closed end 16 side of the inner member 15 to the closed end 14 side of the outer pipe 13, and the specimen 20 is inserted between the outer pipe 13 and the inner member 15. Even when removed, the projecting end of the projecting piece 27 contacts the closed end 14 and the biasing force of the spring 22 against the inner member 15 remains.

Although the inner member 15 has a cylindrical shape in the above-described embodiment, the inner member 15 may have a solid round bar shape. Also, the spacers 18 and 19 may be integrated with the inner member 15. The material of the dilatometer must be compatible with the temperature range used, and it is desirable to use a material with a small linear expansion coefficient for the outer tube 13 and the inner member 15. Carbon-based materials such as carbon can be used.

[0011]

[Effect of the device]

 According to the present invention, the outer tube 13 having the closed end 14 at one end and the inner member 15 provided inside the outer tube 13 so as to be slidable in the longitudinal direction are provided, and one end of the inner member 15 and the outer tube 13 are provided. The test piece 20 is interposed between the closed end 14 and the inner member 15 so that one end of the inner member 15 contacts the closed end 14 of the outer tube 13 via the test piece 20. A spring 22 for urging the closed end 14 is provided, and a displacement gauge 23 for detecting the relative axial displacement of the outer tube 3 and the inner member 15 is provided. By eliminating the need for screws and yokes that are larger than the outer tube, the structure of the dilatometer sample 20 loading part can be simplified and miniaturized, thus making the dilatometer structurally compact and stable. obtain. As a result, a dilatometer suitable for a device such as a HIP that needs to improve space utilization efficiency and having a form equivalent to a thermocouple which is widely used for temperature measurement at present is used, and thus research on sintering technology under high pressure is performed. It can provide a useful means for further promotion.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front view.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

 13 Outer pipe 14 Closed end 15 Inner member 18 Spacer 20 Specimen 22 Spring 23 Displacement meter 27 Projecting piece

Claims (2)

[Scope of utility model registration request] 1. An outer tube (13) having a closed end (14) at one end,
Inner member provided inside the outer tube (13) slidably in the longitudinal direction
(15) and one end of the inner member (15) and the closed end (1
The specimen (20) is interposed between the specimen (20) and the inner member (15) so that one end of the inner member (15) contacts the closed end (14) of the outer tube (13) through the specimen (20). A spring (22) for urging the inner member (15) toward the closed end (14) side of the outer pipe (13) is provided, and the relative displacement of the outer pipe (13) and the inner member (15) in the axial direction. A dilatometer characterized in that a displacement meter (23) for detecting the amount is provided. 2. A spacer (18) for maintaining concentricity between the outer tube (13) and the inner member (15) is provided at the end of the inner member (15) on the side of the specimen (20), The dilatometer according to claim 1, wherein the spacer (18) is provided with a protruding piece (27) protruding toward the closed end (14) side of the outer tube (13).