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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (2권4호 2-8)

A Study on the High Temperature Properties (Compressive Strength, Expansion) of Synthetic Sand using Domestic Silica Sand (Mooryang Silica Sand)

국내규사(國內硅砂)를 사용(使用)한 합성사(合成砂)의 고온성질(高溫性質) (압축강도(壓縮强度), 팽장(膨張)) 에 관(關)한 연구(硏究)

Byung- Guk Yun*, Kye -Wan Lee**

*Graduate School of han yang univ., **han yang univ.

Abstract

The behavior of sand and mold at high temperatures was generally agreed to importantly affect the quality of castings made. By changing water content through 2,4,6 and 8%, and bentonite content through 5,7,9 and 11%, specimens have been made according to the respective composition. Specimens have been subjected to hot compressive strength and thermal expansion at 400, 600, 800 and 1000℃ respectively. The results obtained were as follows ; 1. At each temperature, thermal expansion decreased and hot compressive strength increased with the increase in water content. 2. After thermal expansion was peaked at approximately 1000℃ the contraction and maximum hot compressive strength appeared. 3. At each temperature, maximum hot compressive strength appeared 2%, 4,6% and 8% water content for 7%, 9% and 11% bentonite content respectively. 4. When 2% H_2O was added, though bentonite content was increased, hot compressive strength did not rarely change. 5. Until the thermal expansion was completed the required time was 15-18 minutes at 400℃ and 600℃, and 10-13 minutes at 800℃. At 1000℃, the required time was 7-9 minutes in order to gain the maximum expansion, after that, contraction proceeded during 3-4 minutes before expansion was completed.

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