YB/T 4549-2016 堇青石-莫来石窑具/Cordierite-mullite kiln furniture

堇青石-莫来石窑具

1范围

  本标准规定了革青石-莫来石窑具的牌号、形状尺寸,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。

  本标准适用于各种工业窑炉用革青石-莫来石窑具产品(以下简称窑具)

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(包括所有的修改单)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 3001耐火材料，常温抗折强度试验方法

  GB/T 3002耐火材料 高温抗折强度试验方法

  GB/T 7320耐火材料热膨胀试验方法

  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 10326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 30873耐火材料 抗热震性试验方法

  YB/T172 硅砖定量相分析 X射线衍射法

3 牌号和形状尺寸

3.1 按特点和用途的不同,窑具分为 CMG1、CMG2、CMD1、CMD2 等四个牌号。牌号中的前两个字母分别为堇青石、莫来石英文单词的首字母;第三个字母G表示高温型,D表示低温型;数字1表示慢烧型。2 表示快烧型。

3.2 窑具的形状尺寸由供需双方协商决定。

4技术要求

4.1 窑具的理化指标应符合表1的规定。

表1堇青石-莫来石窑具的理化指标
项目	指 标
牌号	CMG1	CMG2	CMD1	CMD2
体积密度/g.cm-3	≥1.85
显气孔率/%	26±4
常温抗折强度/MPa	≥10
高温抗折强度(1250℃X0.5h)/MPa	≥12		≥9
热膨胀系数(20℃~1000℃)/106.℃-1	≤2.8	≤3.8	≤2.8	≤3.8
抗热震性(1100℃,水冷)/次	≥30
方石英相	不得检出

 

4.2 窑具的外观尺寸允差应符合表2的规定。

表2堇青石-莫来石窑具的外观尺寸允差
项目	相对允差/%	最小允差/mm
平面度和直线度	0.4	±1.5
长度	1.0	±1.0
宽度	1.0	±1.0
厚度	–	±1.0
注:如果根据相对允许差计算出偏差的绝对值小于等于最小允差的绝对值,则允差以最小允差计。

 

5 试验方法

5.1试样制备按 GB/T 7321 进行。

5.2体积密度、显气孔率的测定按 GB/T 2997 进行。

5.3常温抗折强度的测定按 GB/T 3001 进行。

5.4高温抗折强度的测定按 GB/T 3002 进行。

5.5热膨胀系数的测定按 GB/T 7320 进行。

5.6抗热震性的测定按 GB/T 30873 的方法2进行。试样尺寸为长 200mm~230mm、宽 100mm~5.6150mm、厚度根据供需双方协商确定。在试样制备过程中不得有因制样而造成的裂纹等缺陷,否则重新制样。试验采用整体急冷急热法进行,以试样出现可见裂纹时所经历的急冷急热循环次数作为该试样的抗热震性次数。

5.7 方石英相的测定按 YB/T 172 进行。

5.8 外观尺寸的检査及其允差的测定按 GB/T 10326 进行,其中平面度和直线度的测定按 GB/T 10326中检查扭曲的平板-塞尺法进行。

6 质量评定程序

6.1组批

  窑具按同一牌号组批,每批不超过 20t.

6.2 抽样及合格判定规则

  窑具的抽样和验收按 GB/T 10325 进行。体积密度、高温抗折强度、抗热震性、外观尺寸为出厂验收检验项目。

6.3 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。

7 包装、标志、运输、储存和质量证明书

7.1 窑具的包装、标志、运输和储存按 GB/T 16546 进行,

7.2 窑具发出时应附有供方质量部门签发的质量证明书,载明供方名称或厂标、需方名称、发货日期、合同号、产品名称、标准编号、牌号、砖号、批号及相应的理化指标检验结果等项目。

 

 

 

Cordierite-mullite kiln furniture

1 Range

  This standard specifies the brand, shape, size, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificate of the leather bluestone-Mullette kiln.

  This standard is applicable to all kinds of leather bluestone – mullite kiln products for industrial furnaces (hereinafter referred to as kiln tools)

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 amendment orders) applies to this document.

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

  GB/T 3001 refractories, normal temperature bending strength test method

  GB/T 3002 refractories high temperature bending strength test method

  GB/T 7320 refractory thermal expansion test method

  GB/T 7321 shaped refractory product sample preparation method

  GB/T 10325 shaped refractory products acceptance sampling inspection rules

  GB/T 10326 shaped refractory products size, appearance and section inspection method

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

  Test method for thermal shock resistance of GB/T 30873 refractories

  YB/T172 silicon brick quantitative phase analysis by X-ray diffraction method

3 grade and shape size

3.1 According to the different characteristics and uses, kiln furniture is divided into CMG1, CMG2, CMD1, CMD2 and other four brands. The first two letters in the brand are the first letters of the English words cordierite and mullite respectively; The third letter G stands for high temperature type and D for low temperature type; The number 1 indicates the slow-burning type. 2 indicates fast burning type.

3.2 The shape and size of the kiln furniture shall be determined by the negotiation between the supply and demand parties.

4 Technical Requirements

4.1 The physical and chemical indexes of kiln utensils shall comply with the provisions of Table 1.

Table 1 Physicochemical indexes of cordierite-mullite kilns
Item	Index
Brand	CMG1	CMG2	CMD1	CMD2
Bulk density/g.cm-3	≥1.85
Apparent porosity/%	26±4
Flexural strength at room temperature/MPa	≥10
High temperature bending strength(1250℃X0.5h)/MPa	≥12		≥9
Coefficient of thermal expansion(20℃~1000℃)/106.℃-1	≤2.8	≤3.8	≤2.8	≤3.8
Thermal shock resistance(1100℃,water-cooling)/次	≥30
Cristobalite facies	non-detectable

4.2 The appearance size tolerance of kiln furniture shall comply with the provisions of Table 2.

Table 2 The apparent size tolerance of cordierite-mullite kiln tools
Item	Relative tolerance/%	Minimum tolerance/mm
Flatness and straightness	0.4	±1.5
Length	1.0	±1.0
Breadth	1.0	±1.0
Thickness	–	±1.0
Note: If the absolute value of the deviation calculated from the relative permissible difference is less than or equal to the absolute value of the minimum tolerance, the tolerance is measured by the minimum tolerance.

 

5 Test methods

5.1Sample preparation was carried out according to GB/T 7321.

5.2 The bulk density and apparent porosity were measured according to GB/T 2997.

5.3 The flexural strength at room temperature is measured according to GB/T 3001.

5.4 The bending strength at high temperature should be measured according to GB/T 3002.

5.5 The coefficient of thermal expansion was measured according to GB/T 7320.

5.6 The thermal shock resistance was measured according to method 2 of GB/T 30873. The sample size is 200mm~230mm long, 100mm~5.6150mm wide, and the thickness is determined by negotiation between the supply and demand parties. In the process of sample preparation, there should be no cracks and other defects caused by sample preparation, otherwise, the sample should be prepared again. The test was carried out by integral quench and quench heating method, and the number of quench and quench heating cycles experienced by the sample when visible cracks appeared was taken as the number of thermal shock resistance of the sample.

5.7 The cristobalite phase was determined according to YB/T 172.

5.8 The inspection of the appearance size and the determination of its tolerance shall be carried out according to GB/T 10326, where the determination of flatness and straightness shall be carried out according to the flat-gauge method used in GB/T 10326 to check the distortion.

6 Quality assessment procedures

6.1 Batch Groups

  Kiln furniture shall be batch according to the same brand, and each batch shall not exceed 20t.

6.2 Sampling and conformity determination rules

  Sampling and acceptance of kiln furniture is carried out according to GB/T 10325. Bulk density, high temperature flexural strength, thermal shock resistance, appearance size are factory acceptance inspection items.

6.3 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.

7 Packing, marking, transportation, storage and quality certificate

7.1 Packaging, marking, transportation and storage of kiln furniture shall be carried out in accordance with GB/T 16546.

7.2 The quality certificate issued by the quality department of the supplier shall be attached when the kiln furniture is issued, indicating the name of the supplier or factory standard, the name of the demander, the date of delivery, the contract number, the product name, the standard number, the brand number, the brick number, the batch number and the corresponding physical and chemical index test results.