SU1379285A1 - Ceramic material - Google Patents

Description

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CO YO 00 SL

The invention relates to the production of aluminum-magnesian spinel ceramics used in the manufacture of abrasive material for the vibratory treatment of cutting tools and the production of grinding media for grinding high-frequency substances.

The aim of the invention is to increase the mechanical strength and reduce abrasion during vibration treatment.

Ceramic material was prepared as follows.

Magnesium oxide powder with an average grain size of 20-40 µm is moistened with an aqueous solution of the salts of the corresponding oxides added. Moist 5 burned twice. The pre-stage calcination is carried out to burn off the binder (in the alumina bed) at 1000 ° C, the final calcination to sinter the material and form a micron mass is thoroughly mixed and

burned with an exposure time of 0.5 hours. 2Q of the ceramic structure is carried out at

In the size of 1–2 µm preliminarily crushed to a shutter speed of 2 µm, alumina and magnesium oxides with an additive are added.

of the material used are aqueous solutions of the following 25 salts: ScCNO,) ,, Н (ЫОз) 4, ThCNO ,,), Ge (NO,), Nb (NO,),.

salt solution Nb (NO,), in the amount of 0.25–1 wt.% (in terms of), the mixture is moistened with a solution of salt and thoroughly mixed (the volume of the solution exceeds the powder volume by 3 times), then dried, and material are presented in table 1, the material properties in table 2.

trit in briquettes with a diameter of 10 mm and a height of 5 mm at a pressure of 300 MPa and calcined at 1 hour exposure. the specific surface of the powder 1.2 m / g.

From the obtained powder, a casting slip is prepared with the addition of 12% by weight of paraffin.

By the method of hot pouring under pressure, slips are molded into samples that are fired twice. The pre-stage calcination is carried out to burn off the binder (in the alumina bed) at 1000 ° C, the final calcination to sinter the material and form micro-compositions of the ceramic material are presented in Table 1, the material properties are in Table 2.

Table 1

1.5 1.0

0.5

1.5

1.0

1.0

0.5

0.07 0.43

0.25

0.43 0.5 0.251.0

0.10

1.40

0.5

Bulk weight, g / cm

Strength at static bend, kgf / cm

Abrasion during vibration treatment,%

3.50 3.45 3.52 3.52 3.51 3.51 3.49 3.51

3200 3150 3400 6.4 7.0 3.2

3350 3250 3200 3200 3300

3.5

5.0 6.0 0.3 4.1

Table 2

3350 3250 3200 3200 3300

3.5

5.0 6.0 0.3 4.1

Claims (1)

CERAMIC MATERIAL, including A1 _g Oe, MgO, one component from the group Bs ₁ O _e , Ge0 ₂ , Th0 ₂ , HfO _{ , characterized in that, in order to increase mechanical strength and reduce abrasion during vibration processing, it additionally contains Nb ^ 0 y in the following ratio of components, wt.%: A1.0 _e 72-85 MgO 13-26 One component from the group: BS _g O _g , GeO _t .TIO ,, HfO _t 0.5-2.0 Nb-jO'g 0.25-1.0 ss ω GO Μ ς © bO Q0 cl