燃煤熱風爐配件對耐熱保溫材料的七點性能要求

由於蒸汽熱風爐屬於特種設備，本身就是制造熱源。所以燃煤蒸汽熱風爐在制造時對使用的金屬材料的要求就格外嚴格。而挑選耐熱、保溫材料時所註重的主要性能有下列各項：(l)耐火性。耐熱、保溫材料的耐火性一般用耐火度和荷重軟化溫度束表示。耐火度是指材料在高溫下抵抗熔化的能力，它是耐熱材料最重要的性能之一。材料耐火度的高低取決於其化學組成和雜質的種類及含量。耐熱材料的使用溫度不允許超過其耐火度，也不能以耐火度作為材料使用溫度的上限。和重軟化溫度是指材料在一定的壓力(0.2MPa)下不斷加熱，發生一定變形量時的溫度，它是耐熱材料高溫機械性能的主要指標。荷重軟化溫度與材料的化學組成和組織結構有關，材料的荷重軟化溫度越高，則其使用溫度越高。
Because the steam hot stove belongs to the special equipment, it is the heat source in itself. Therefore, the requirements for the metal materials used in the manufacture of the coal-fired steam hot stove are particularly strict. The main properties of heat and insulation materials are as follows:
(L) fire resistance. The fire resistance of heat-resistant and thermal insulation materials is usually expressed by refractoriness and load softening temperature. Refractoriness refers to the ability of materials to resist melting at high temperatures. It is one of the most important properties of heat-resistant materials. The refractoriness of materials depends on their chemical composition and the type and content of impurities. The service temperature of the refractory material shall not exceed its refractoriness, nor shall the refractoriness be used as the upper limit of the service temperature of the material. Resoftening temperature refers to the temperature at which the material is continuously heated under a certain pressure (0.2 MPa) and a certain amount of deformation occurs. It is the main index of high-temperature mechanical properties of heat-resistant materials. The load softening temperature is related to the chemical composition and structure of the material. The higher the load softening temperature is, the higher the service temperature is.
(2)常溫及高溫耐壓強度。常溫耐壓強度是指材料在常溫下所能承受的最大壓應力，它主要用來判斷成型材料的質量、抗撞擊、抗磨損以及抵抗其他機械作用力的能力。高溫耐壓強度是指材料在一定溫度下所能承受的最大壓應力
(2) compressive strength at room temperature and high temperature. Compressive strength at room temperature refers to the maximum compressive stress that materials can bear at room temperature. It is mainly used to judge the quality of forming materials, impact resistance, wear resistance and resistance to other mechanical forces. High temperature compressive strength refers to the maximum compressive stress of materials at a certain temperature.
(3)高溫體積穩定性（殘餘收縮或膨脹）。高溫體積穩定性是指材料在高溫下長期使用中產生的再結晶和進一步燒結，使材料體積發生收縮或膨脹。這種變化是不可逆轉的變化。
(3) high temperature volume stability (residual shrinkage or expansion). Volume stability at high temperature refers to the recrystallization and further sintering of materials during long-term use at high temperature, resulting in shrinkage or expansion of material volume. This change is irreversible.
(4)熱震穩定性。熱震穩定性是指材料承受驟冷驟透水地坪熱的性能，它反映耐熱材料抵抗溫度變化而不損壞的能力。
(4) thermal shock stability. Thermal shock stability refers to the ability of materials to withstand sudden cooling and sudden heating, which reflects彩色沥清地坪 the ability of heat-resistant materials to resist temperature changes without damage.
(5)抗渣性。抗渣性是指耐熱材料在高溫下抵抗熔渣化學、物理作用的性能。選用耐熱材料時應註意熔渣的性質，使之能適應熔渣的特性。
(5) slag resistance. Slag resistance refers to the resistance of heat resistant materials to chemical and physical functions of molten slag at high temperatures. The properties of molten slag should be paid attention to when selecting heat resistant materials, so that they can adapt to the characteristics of molten slag.
(6)容重，容重是材料單位體積的重量，其大小影響到燃煤蒸汽熱風爐構架的承載力。同一種材料的容重不同，其導熱性能和耐壓強度也不同口
(6) Volume weight, which is the weight per unit volume of material, affects the bearing capacity of the frame of coal-fired steam stove. The same material has different bulk density, and its thermal conductivity and compressive strength are also different.
(7)導熱性。材料的導熱性通常用導熱系數來表示，導熱系數隨材料種類和使用溫度而變化。導熱性是衡量耐熱保溫材料特別是保溫材料優劣的一個重要性能指標。
(7) thermal conductivity. The thermal conductivity of materials is usually expressed by thermal conductivity, which varies with the type of materials and the temperature of use. Thermal conductivity is an important performance index to measure heat insulation materials, especially insulation materials.