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ᛘᗕǺȗș̥ኑˀǺΰ⓯ǦǮ⓹۰ɃɱɧɋȷℋǽᡡયමǷᑿ፦ᣀමૅୖ᰾̘ɿәቆવɿɖᖅໞֳଉ ɿᆎᨀ౯Ԅଉ ଉ ɿଏԆֳଉ ɿ୮ᚊ Iଉ ఎগકগકрἕ۰ᥴకકಊᢼᥴకકଗფࢫ816-8580 ᱨ᭔ᆎᅠలᆎᅠӸ 6-1 ଉఎগકগકрἕ۰ᥴకકᮾ᳣рᢼᲇકȤϘࢫ816-8580 ᱨ᭔ᆎᅠలᆎᅠӸ 6-1 ଉ ଉ ሱBAHAM ཪᮾࢫ150-6019 ኇ̸ȩগᨀٚኇ‫ؤ‬ŋ 2-3-6-201A ceramic coating slurry was designed, which suspended or dissolved ceramic components silica, titania, alumina and kaolinite and glass-forming components alkali silicates and soda ash in water. SiO 2 -Al 2 O 3 -TiO 2 based composite films about 100 mm thick were deposited on a steel plate by coating the slurry with a brush, followed by drying and calcination. The ceramic coatings obtained under proper conditions were found to exhibit excellent stability over a wide range of temperature. As evaluated by copper electrodeposition method, through-holes were present in the coatings calcined at 700c C or below, while they were eliminated completely after calcination at 1100c C in N 2 . Vickers hardness of the coatings increased with increasing calcination temperature, while adhesive strength went through a sharp maximum at 800c C.

ḩൎȡ֝൧ǦǮɃɱɧɋȷɁȇǽȪɳȳɲȹȬɛदᚊ‫ף‬ǺȗȚȻʀɎȫɻȸℋǽἻ‫ك‬ૅୖ᰾̘ɿɖᖅໞֳଉ ɿᆎᨀ౯Ԅଉ ଉ ɿଏԆֳଉ ɿ୮ᚊ Iଉ ఎগકগકрἕ۰ᥴకકಊᢼᥴకકଗფࢫ816-8580 ᱨ᭔ᆎᅠలᆎᅠӸ 6-1 ଉఎগકগકрἕ۰ᥴకકᮾ᳣рᢼᲇકȤϘࢫ816-8580 ᱨ᭔ᆎᅠలᆎᅠӸ 6-1 ଉ ଉ ሱBAHAM ཪᮾࢫ150-6019 ኇ̸ȩগᨀٚኇ‫ؤ‬ŋ 2-3-6-201Densification of a ceramic coating based on SiO 2 -Al 2 O 3 -TiO 2 using wet processing was investigated by controlling microscopic grains of materials used. The grains of the materials used in coating slurry were reduced from their initial size of about 10 mm to less than 5 mm in diameter using ball-milling. The ceramic composite films thus prepared were deposited about 100 mm in thickness on a steel plate by slurry coating with a doctor blade, followed by drying and calcination in air. It was found that the coating prepared was stable to heating up to 800c C in air, although the use of overly small grains easily caused cracks on the surface. By optimizing the amount of alkali silicate, however, such cracks could be eliminated from the coating, and the number of through-holes in the coating could be drastically decreased. The ceramic coating obtained by both the control of grain size in powders and the optimal addition of the alkali silicate showed excellent densification, thermal stability and adhesion strength.

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