FURNACE CORE TUBE

• Main Authors: MATSUI KATSUMI, NONAKA KYOKO, MASUDA KENTA
• Format: Patent
• Language: English; Japanese
• Published: 09.08.2018
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS; GLASS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

PROBLEM TO BE SOLVED: To provide a furnace core tube that can be used in a furnace at 1300°C or less, and has excellent durability and temperature controlling properties.SOLUTION: A furnace core tube has a metal cylindrical tube 1, the internal surface of which is coated with a glass material 2 of 1-5 mm in thickness. The glass material 2 has a melting point of 1300°C or more and a thermal expansivity of 9×10-17×10/K or less, and contains following components: SiO: 50-70 wt.%, preferably 58-63 wt.%, AlO: 10-23 wt.%, preferably 12-20 wt.%, FeO: 0.05-0.5 wt.%, preferably 0.2-0.4 wt.%, CaO: 10-18 wt.%, preferably 10-16 wt.%, NaO: 1-2 wt.%, preferably 1-2 wt.%, KO: 4-6 wt.%, preferably 4-6 wt.%, and MgO: 0.01-0.5 wt.%, preferably 0.05-0.4 wt.%.SELECTED DRAWING: Figure 1 【課題】１３００℃以下の加熱炉で使用できる、耐久性及び温度制御性に優れる炉心管の提供。【解決手段】金属製円筒管１の内表面にガラス材料２を１〜５ｍｍの厚みで被覆した炉心管であって、ガラス材料２が、１３００℃以上の融点を有し、熱膨張率が９×１０-6〜１７×１０-6／Ｋ以下であり、ＳｉＯ2：５０〜７０重量％、特に好ましくは、５８〜６３重量％、Ａｌ2Ｏ3：１０〜２３重量％、特に好ましくは、１２〜２０重量％、Ｆｅ2Ｏ3：０．０５〜０．５重量％、特に好まくは、０．２〜０．４重量％、ＣａＯ：１０〜１８重量％、特に好ましくは、１０〜１６重量％、Ｎａ2Ｏ：１〜２重量％、特に好ましくは１〜２重量％、Ｋ2Ｏ：４〜６重量％、特に好ましは、４〜６重量％、及びＭｇＯ：０．０１〜０．５重量％、特に好まくは、０．０５〜０．４重量％の成分を有するガラス材料である炉心管。【選択図】図１