低导热多层复合莫来石砖

1 范围

  本标准规定了低导热多层复合莫来石砖的术语和定义、牌号,技术要求、试验方法、质量评定程序、包装、标志、运输、储存和质量证明书。

  本标准适用于水泥窑用低导热多层复合莫来石砖。

2 规范性引用文件

  下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的们单)适用于本文件。

  GB/T 2997 致密定形耐火制品体积密度、显气孔率和真气孔率试验方法

  GB/T 5072耐火材料 常温耐压强度试验方法

  GB/T 6900铝硅系耐火材料化学分析方法

  GB/T 7321定形耐火制品试样制备方法

  GB/T 10325 定形耐火制品验收抽样检验规则

  GB/T 103265 定形耐火制品尺寸、外观及断面的检查方法

  GB/T 16546 定形耐火制品包装、标志、运输和储存

  GB/T 16555 含碳、碳化硅、氮化物耐火材料化学分析方法

  GB/T 17911 耐火材料陶瓷纤维制品试验方法

  GB/T 22588 闪光法测量热扩散系数或导热系数

  GB/T 30873 耐火材抗热震性试验方泛

  YB/T 370 耐火材料荷重软化温升温法)

  YB/T 4130 耐火材料 导热系数试验方法(水流量平板法)

3 术语和定义

  下列术语和定义适用于本文件，

3.1

  低导热多层复合莫来石砖

  由工作层、保温层、隔热层组成的,其主矿物相为莫来石的低导热耐火制品。

4 牌号

  低导热多层复合莫来石砖工作层,按理化指标分为DDR-1650、DDR-1600 两个牌号,其中 DDR 为“低导热”汉语拼音首字母,后面的数字表示荷重软化开始温度。

  保温层为高强微孔莫来石砖,用 GWM-50 表示,其中,G、W、M 为“高强”“微孔”“莫来石”首个汉字的汉语拼音首字母,后面的数字为三氧化二铝含量。

  隔热层为铝锆纤维板,用 LGB-1200 表示,其中,LGB为“铝锆板”的汉语拼音首字母,后面的数字为线收缩率的测定温度。

5 技术要求

5.1低导热多层复合莫来石砖工作层的理化性能指标应符合表1的规定。

表1低导热多层复合莫来石砖工作层的理化性能指标
项目			DDR-1650	DDR-1600
w(Al2O3)/%	μ0	≥	60
显气孔率/%	μ0	≤	19
	σ		1.0
体积密度/(g/cm3)	μ0	≥	2.55	2.50
	σ		0.03
常温耐压强度/MPa	μ0	≥	90	70
	σ		10
0.2 MPa荷重软化开始温度T0.6/℃	μ0	≥	1650	1600
抗热震性(1100℃,水冷)/次	μ0	≥	20	15
	σ		3
导热系数(1000℃)/(W/(m.K))	μ0	≤	2.6
注:导热系数指标不作验收条件,可提供数据。

 

5.2 低导热多层复合莫来石砖保温层的理化性能指标应符合表2的规定。

表2低导热多层复合莫来石砖保温层的理化性能指标
项 目			GWM-50
w(Al2O3)/%	μ0	≥	50
显气孔率/%	μ0	≤	35
	σ		1.0
体积密度/(g/cm3)	μ0	≤	2.35
	σ		0.03
常温耐压强度/MPa	μ0	≥	60
	σ		10
导热系数(热面温度800℃)/(W/(m·K))	μ0	≤	1.5
注:导热系数指标不作验收条件,可提供数据。

 

5.3 低导热多层复合莫来石砖隔热层的物理性能指标应符合表3的规定。

表3低导热多层复合莫来石砖隔热层的物理性能指标
项 目			LGB-1200
加热永久线变化(1200℃X24 h)/%	μ0		0~-2.5
导热系数(热面温度500℃)/(W/(m·K))	μ0	≤	0.13
注:导热系数指标不作验收条件,可提供数据。

 

5.4 低导热多层复合莫来石砖粘贴隔热层后的整体外观及尺寸允许偏差应符合表4的规定。

表4外观及尺寸允许偏差 单位为毫米
项目			指 标
尺寸允许偏差	尺寸≤110		±1
	110<尺寸<200		±1.5
	尺寸>200		±2
	厚度相对边差	≤	1
扭曲	长度≤230	≤	1
	长度 231~300		1.5
	长度>300		2
缺角长度(a+b+c)			30
缺棱长度(e+f+g)			50
裂纹长度	宽度≤0.10		不限制
	宽度0.10～0.25	≤	50
	宽度≥0.25		不准有
	工作层与保温层结合处		不准有
外观	层裂		不准有
	熔洞直径≥5		不准有
	熔洞直径≤5	≤	5个

6 试验方法

6.1 检验制样三层分别按 GB/T 7321 进行,取样时避开工作层与保温层结合部位。

6.2 工作层三氧化二铝含量的测定按 GB/T.铝含量的测定按 GB/T 6900进行。

6.3 显气孔率和体积密度的测定按 GB/T 29

6.4 常温耐压强度的测定按 GB/T 5072 进行。

6.5 荷重软化温度的测定按 YB/T 370 进行。

6.6 抗热震性的测定按 GB/T 30873 进行。

6.7 工作层的导热系数的测定按 GB/T 22588 进行;保温层、隔热层导热系数的测定按 YB/T 4130 进行。

6.8 隔热层加热永久线变化的测定按 GB/T 17911 进行。

6.9 外观及尺寸允许偏差的检査按 GB/T 10326 进行。

7 质量评定程序

7.1 组批

  产品按同一牌号进行组批,每批数量不大于 100 t。

7.2 抽样及合格判定规则

  产品的抽样及验收按 GB/T 10325 进行,按合同约定检测项目进行。

7.3 合格评定形式

  合格评定可采用供货方声明、使用方认定或第三方认证的形式进行。

8 包装、标志、运输、储存和质量证明书

8.1 产品的包装、标志、运输、储存按 GB/T 16546 进行。8.2 产品发出时应附有供方质量部门签发的质量证明书,质量证明书应载明供方名称或厂标、需方名称、发货日期、合同号、标准编号、产品名称、牌号、砖号、批号及相应的理化检验结果等。

 

 

Low thermal conductivity multilayer mullite based bricks

1 Range

  This standard specifies the terms and definitions, grades, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of low thermal conductivity multilayer composite mullite bricks.

  This standard is applicable to multi-layer composite mullite bricks with low thermal conductivity for cement kilns.

2 Normative reference documents

  The following documents are essential for the application of this document. For dated references, the date-only version applies to this document. For undated references, the latest version (including all lists) applies to this document.

  Test method for bulk density, apparent porosity and true porosity of GB/T 2997 compact shaped refractory products

  GB/T 5072 refractories – normal temperature compressive strength test method

  GB/T 6900 aluminum-silicon refractory chemical analysis method

  GB/T 7321 shaped refractory product sample preparation method

  GB/T 10325 shaped refractory products acceptance sampling inspection rules

  GB/T 103265 shaped refractory products size, appearance and section inspection method

  GB/T 16546 shaped refractory products packaging, marking, transportation and storage

  GB/T 16555 Method for chemical analysis of refractories containing carbon, silicon carbide and nitride

  GB/T 17911 refractory ceramic fiber products test method

  GB/T 22588 flash method to measure thermal diffusivity or thermal conductivity

  GB/T 30873 refractory thermal shock resistance test

  YB/T 370 refractories loaded softening temperature rise method)

  Test method for thermal conductivity of YB/T 4130 Refractories (Water flow plate method)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

  Low thermal conductivity multilayer composite mullite brick

  A low-thermal refractory product composed of a working layer, a thermal insulation layer and a thermal insulation layer, the main mineral phase of which is mullite.

4 Brand

  Low thermal conductivity multi-layer composite mullite brick working layer, according to the physical and chemical indicators are divided into DDR-1650, DDR-1600 two grades, wherein DDR is the “low thermal conductivity” Chinese pinyin initial letter, the number behind indicates the load softening starting temperature.

  The insulation layer is a high-strength microporous mullite brick, which is represented by GWM-50, where G, W, M are the Chinese pinyin initial letters of the first Chinese character of “high-strength”, “microporous” and “mullite”, and the following number is the content of aluminum oxide.

  The insulation layer is aluminum-zirconium fiberboard, represented by LGB-1200, where LGB is the Chinese pinyin initial letter of “aluminum-zirconium plate”, and the number behind is the measurement temperature of the line shrinkage rate.

5 Technical Requirements

5.1 The physical and chemical properties of the working layer of low thermal conductivity multi-layer composite mullite brick shall comply with the provisions of Table 1.

Table 1 The physical and chemical properties of the working layer of low thermal conductivity multilayer composite mullite brick
Item			DDR-1650	DDR-1600
w(Al2O3)/%	μ0	≥	60
Apparent porosity/%	μ0	≤	19
	σ		1.0
Bulk density/(g/cm3)	μ0	≥	2.55	2.50
	σ		0.03
Compressive strength at room temperature/MPa	μ0	≥	90	70
	σ		10
0.2MPa load softening starting temperature T0.6/℃	μ0	≥	1650	1600
Thermal shock resistance (1100℃, water cooling)/ time	μ0	≥	20	15
	σ		3
Thermal conductivity(1000℃)/(W/(m.K))	μ0	≤	2.6
Note: Thermal conductivity index is not accepted as a condition, data can be provided.

 

5.2 The physical and chemical properties of low-thermal conductivity multi-layer composite mullite brick insulation layer shall comply with the provisions of Table 2.

Table 2 Physicochemical properties of low thermal conductivity multi-layer composite mullite brick insulation layer
Item			GWM-50
w(Al2O3)/%	μ0	≥	50
Apparent porosity/%	μ0	≤	35
	σ		1.0
Bulk density/(g/cm3)	μ0	≤	2.35
	σ		0.03
Compressive strength at room temperature/MPa	μ0	≥	60
	σ		10
Thermal conductivity (hot surface temperature 800℃)/(W/(m·K))	μ0	≤	1.5
Note: Thermal conductivity index is not accepted as a condition, data can be provided.

 

5.3 The physical performance indexes of the low thermal conductivity multi-layer composite mullite brick insulation layer shall comply with the provisions of Table 3.

Table 3 Physical performance indexes of low thermal conductivity multilayer composite mullite brick insulation layer
Item			LGB-1200
Heating permanent line change(1200℃X24 h)/%	μ0		0~-2.5
Thermal conductivity (hot surface temperature 500℃)/(W/(m·K))	μ0	≤	0.13
Note: Thermal conductivity index is not accepted as a condition, data can be provided.

 

5.4 The overall appearance and size permissible deviations of low thermal conductivity multi-layer composite mullite brick after pasting heat insulation layer shall comply with the provisions of Table 4.

Table 4 The unit of permissible deviation in appearance and size is mm
Item			Index
Allowable deviation of dimension	Dimension≤110		±1
	110<Dimension<200		±1.5
	Dimension>200		±2
	Thickness relative to edge difference	≤	1
Contort	Length≤230	≤	1
	Length 231~300		1.5
	Length>300		2
Missing Angle length(a+b+c)			30
Missing edge length(e+f+g)			50
Crack length	Breadth≤0.10		No limit
	Breadth0.10～0.25	≤	50
	Breadth≥0.25		Be forbidden from
	The joint of the working layer and the insulation layer		Be forbidden from
Appearance	Slabbing		Be forbidden from
	Hole diameter≥5		Be forbidden from
	Hole diameter≤5	≤	Five

 

6 Test methods

6.1 The three layers of sample preparation shall be inspected according to GB/T 7321 respectively, and the combination of working layer and thermal insulation layer shall be avoided during sampling.

6.2 The content of aluminum oxide in the working layer is determined according to GB/T. The content of aluminum is determined according to GB/T 6900.

6.3 The apparent porosity and bulk density were measured according to GB/T 29

6.4 The compressive strength at room temperature shall be measured according to GB/T 5072.

6.5 The load softening temperature was measured according to YB/T 370.

6.6 The thermal shock resistance was measured according to GB/T 30873.

6.7 The thermal conductivity of the working layer is measured according to GB/T 22588; The thermal conductivity of thermal insulation layer and thermal insulation layer is measured according to YB/T 4130.

6.8 The determination of the permanent line change of heat insulation was carried out according to GB/T 17911.

6.9 The permissible deviation of appearance and size shall be checked according to GB/T 10326.

7 Quality assessment procedures

7.1 Batch

  The products shall be grouped according to the same brand, and the quantity of each batch shall not exceed 100 t.

7.2 Rules for sampling and conformity determination

  The sampling and acceptance of products shall be carried out according to GB/T 10325, and the test items shall be carried out according to the contract.

7.3 Form of conformity assessment

  The conformity assessment can be made in the form of the supplier’s declaration, the user’s certification or the third party’s certification.

8 Packing, marking, transportation, storage and quality certificate

8.1 The packaging, marking, transportation and storage of the product shall be carried out in accordance with GB/T 16546.

8.2 The product shall be issued with a quality certificate issued by the quality department of the supplier, which shall indicate the supplier’s name or factory standard, demander’s name, delivery date, contract number, standard number, product name, brand number, brick number, lot number and corresponding physical and chemical inspection results.