PSI - Issue 42

Shahin Takht Firouzeh et al. / Procedia Structural Integrity 42 (2022) 1069–1073 Shahin Takht Firouzeh / Structural Integrity Procedia 00 (2019) 000–000

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Table 1. Chemical composition of filter material slurry.

Raw Material

Mass fraction %

Mutual Additives

Mass fraction %

Martoxid MR 70 Carbores ® P / L-T***

66.0 20.0

Castament VP 95 L* Contraspum K 1012*

0.3 0.1 1.5

AF 96 / 97

7.7 6.3

C12C*

Luvomaxx N-991

L-T Additives

Mass fraction %

TiO 2 * 0.5 Hexamethylenetetramine** 10 Aluminum* 0.1 Silica* 4 Silicon carbide** 5

*Related to total solid content

**Related to L-T amount

***Two L-T Ratios (5:1 and 3:1)

3. Brazilian Disc Test

In this test, disc shaped specimen is uni-axially compressed along its diameter. Applied loads lead to the formation of in-direct tensile stresses which are almost uniformly distributed along the vertical diameter. These stresses are perpendicularly aligned to the direction of the applied force. In addition to the simplicity of the test application, this is an e ff ective method to test the tensile properties of the brittle materials such as ceramic filter materials. The introduction of the holes to the center of the specimen, creates a stress concentration at the tip of the hole which becomes the initiation point for the crack. The test is applied in a displacement controlled manner with a loading rate of 1 mmmin − 1 . The reaction force is measured using a ME-Systems KD40s 5 kN loading cell. Test temperature was set to 1200 ◦ C using a controlled GERO HTRV40-100 / 17 tube furnace. The specimens are loaded until failure occurs which is defined with a 20% drop from the real-time applied load. 1 illustrates the main crack occurring along the vertical diameter of the specimen. Due to the failure of the first crack, secondary cracks initiate symmetrically from the punch contact points. The test rig for the high temperature BDT is shown in Figure 2.

Fig. 2. HT-BDT test rig.