JPS58148940A - Measuring method of density - Google Patents

Abstract

PURPOSE:To adjust density so as to provide desired characteristics to a calcined ceramic compact, by immersing the green compact of an uncalcined ceramic material in a mercury bath, and measuring the buyancy applied to the green compact thereby preventing the dissolution of the green compact and measuring the accurate density. CONSTITUTION:If there is a need for adjusting the density of ceramics for O2 sensors, etc. accurately, a green compact of a ceramic material prior to calcining is immersed in a mercury bath and the buoyancy that the green compact receives is measured. For example, a table 3 of a measuring device is first brought down to the position of a stopper 14, and the green compact is placed on the tray provided in the end part of a balance pole 8 provided to an electronic balance 7. The weight of the green compact is measured from the numerical value displayed on the balance 7. A motor 12 is run by the signal from an operation box 15 to move the table 3 placed thereon with a sliding table 5 upward so that the green compact measured of the weight is forced into the mercury in a mercury tank 6 on the table 5 by the bottom surface of the tray mounted to the balance pole. The buoyancy applied on the green compact is measured by switching the balance 7 of the pole 8 to measurement of buoyancy. The density of the green compact is operated from the buoyancy and the weight of the green compact, whereby the density is known easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the density of an unfired ceramic compact.

2. Description of the Related Art Conventionally, as a general method for measuring density, there is a method of detecting density by substituting values obtained by measuring the weight of an object to be measured in air and water into a predetermined formula.

The characteristics of the ceramic of the 0□ sensor are deeply related to the density of the ceramic, and the density must be adjusted accurately during the manufacturing process.

However, it is the density of the ceramic material compact before firing that determines the density of the ceramic material after firing, and it is desirable to keep the density of the ceramic material compact before firing at a desired value.

Therefore, in order to measure the density of a ceramic material molded body before firing, when the molded body is immersed in a water or alcohol bath,
There was a problem that the molded body would dissolve in the bath.

Therefore, an object of the present invention is to provide a method for measuring density that can measure the density of a ceramic molded body before firing without dissolving it.

Hereinafter, embodiments of the density measuring method according to the present invention will be described with reference to the drawings.

In the density measuring device shown in the figure for carrying out the density measuring method according to the present invention, a pair of vertical columns 2 are arranged on a base 1, and a pair of sleeves provided on a table 3 are attached to the columns 2. 4 are slidably fitted. A horizontally movable slide table 5 is provided on the top of the table 3, and a cypress 6 in which a water bath is placed is placed on the slide table 5. This 4116 is placed on the slide table 5, and rollers (not shown) are provided on the back surface of the slide table 5 so that it can be moved horizontally on the table 3. There is a weight measuring device 7 at the top end of the pillar 2.
A balance rod 8 is provided and vertically arranged below. A feed shaft 9 having a screw hole extending in the internal axial direction is provided on the lower surface of the table 3. The feed shaft 9 is connected to a gear box 10 arranged on the base 1 through its screw hole.
It is screwed into a worm gear 11 extending vertically from the worm gear 11. The worm gear 11 is driven by an externally disposed electric motor 12 via a gear mechanism (not shown) within the gearbox IO. Furthermore, two rim inlets 13 and 14 are provided on the support 2 to determine the range of movement of the table 3. An operation box 15 for operating the sliding movement of the table 3 is arranged at the pace 1.

The method for measuring the density of a ceramic material molded body according to the present invention having the above configuration is carried out as follows. When measuring the weight of a ceramic material molded body in air, the table 3 is stopped downward and the ceramic material molded body is placed on a tray provided at the end of the balance rod 8 of the weight measuring device 7. At this time, by reading the numerical value displayed on the weight measuring device 7, the weight of the ceramic material molded body in the air can be measured. On the other hand, when measuring the buoyancy of a ceramic material molded body in mercury, the weight measuring device 7
Switch to buoyancy measurement using a switch (not shown). When the ceramic material molded body is placed in the mercury bath 6, the ceramic material molded body floats on the mercury bath. Next, an operation button (not shown) provided on the operation box 15 is operated to start the electric motor 12 and raise the table 3. table 3
When it reaches a predetermined raised position, the ceramic material molded body floating in the mercury bath is still in contact with the back surface of the dish provided on the balance rod 8, and is pushed further into the wood-like bath. At this time, the balance rod 8
The buoyant force given to the ceramic material molded body is transmitted to the weighing device 7, and the weight measuring device 7 displays a value corresponding to the buoyant force. By reading this value, the density of the ceramic material molded body can be determined.

As is clear from the above, by using the density measuring method according to the present invention, the density can be measured without dissolving the ceramic molded material.

[Brief explanation of drawings]

The figure shows a density measuring device having a mercury bath, which is an embodiment of the present invention. Explanation of symbols of main parts 3・Table 5...Slide table 6...
・Mercury tank 7... Electronic balance 8... Balance rod Applicant Japan Electronics Co., Ltd. Agent Patent attorney Rattan material Motohiko 10 /2

Claims (1)

[Claims] A method for measuring density, which comprises immersing a ceramic molded body in a mercury solution and measuring the buoyancy given to the ceramic molded body to measure the density.