YS/T 817-2012 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| YS/T 817-2012 | English | 125 |
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YS/T 817-2012: High purity tellurium---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YST817-2012
YS
NONFERROUS METALS INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
ICS 77.150.99
H 62
High purity tellurium
高 纯 碲
Issued on: NOVEMBER 7, 2012
Implemented on: MARCH 1, 2013
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Requirements... 4
4 Test methods... 5
5 Inspection rules... 6
6 Marking, packaging, transportation and storage... 8
7 Contents of the contract (or purchase order)... 9
High purity tellurium
1 Scope
This standard specifies the requirements, inspection methods, inspection rules,
packaging, marking, transportation, storage, quality certificate and contract (or
purchase order) contents of high-purity tellurium.
This standard applies to high-purity tellurium, which is mainly used in infrared
detectors, infrared lasers, telluride optical fibers, solar cells, gamma-ray detectors,
ohmic contacts, semiconductor cooling elements, copier photosensitive elements,
perpendicular magnetic recording materials and other fields.
2 Normative references
The following documents are essential for the application of this document. For any
dated referenced document, only the dated version applies to this document. For any
undated referenced document, the latest version (including all amendments) applies to
this document.
GB/T 8170-2008 Rules of rounding off for numerical values & expression and
judgment of limiting values
3 Requirements
3.1 Product categories
High-purity tellurium is classified into two grades according to its chemical
composition. Te99.999 and Te99.9999.
3.2 Chemical composition
3.2.1 The chemical composition of high-purity tellurium shall comply with the
requirements of Table 1.
3.2.2 The rounding off of the last digit value of high-purity tellurium impurities and the
determination of the rounded-off value shall be carried out in accordance with Chapter
3 and 4.3.3 of GB/T 8170-2008, respectively.
3.3 High-purity tellurium shall be in the form of rectangular trapezoid or powder
particles. The weight and particle size shall be determined by negotiation between the
supplier and the buyer.
3.4 Appearance quality
High-purity tellurium shall be clean and free of inclusions visible to the naked eye.
3.5 Others
If the purchaser has other requirements for the chemical composition and appearance
quality of high-purity tellurium, they shall be determined through negotiation between
the supply and demand parties.
4 Test methods
4.1 The arbitration analysis method for the chemical composition of high-purity
tellurium shall be determined by negotiation between the supplier and the buyer.
4.2 The weight of high-purity tellurium shall be checked by weighing.
4.3 The appearance quality of high-purity tellurium shall be inspected by visual
inspection.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 High-purity tellurium shall be inspected by the supplier's technical supervision
department to ensure that the product quality complies with this standard or the
provisions of the contract (or purchase order), and a quality certificate shall be
completed.
5.1.2 The purchaser may inspect the received products in accordance with the
provisions of this standard. If the inspection results are inconsistent with the provisions
of this standard or the contract (or purchase order), the purchaser shall raise the issue
with the supplier within 30 days of receipt of the products for resolution through
negotiation between the supplier and the purchaser. If arbitration is required, sampling
shall be conducted on the purchaser's site jointly by the purchaser and the supplier.
5.2 Batching
High-purity tellurium shall be submitted for inspection in batches. One batch shall
consist of tellurium ingots of the same grade cast from the same batch of raw materials,
with each batch not exceeding 100 kg.
5.3 Inspection items
Each batch of high-purity tellurium shall be inspected for chemical composition,
appearance quality and weight of the tellurium ingots.
5.4 Sampling and sample preparation
5.4.1 Sampling and sample preparation for chemical composition of high-purity
tellurium ingots (Te99.999)
5.4.1.1 Sampling quantity. Randomly select 20% of the total number of tellurium ingots
as sample ingots. The total number of sample ingots shall be a multiple of 6 to facilitate
grouping. If the number of ingots after grouping is less than 6, they shall be
supplemented from the tellurium ingots, but they shall not be discarded.
5.4.1.2 Sampling method. Drill the ingots in groups of 6 and take samples. No lubricant
shall be used and the drilling speed shall not cause oxidation of the specimen. The
surface of the sample shall be removed and the drilling depth shall be between one-half
and two-thirds of the ingot thickness.
Drilling method. Use a tungsten carbide drill with a diameter of 6~10 mm to take
samples. Arrange the casting surface A and the bottom surface B in sequence to form a
rectangle. Draw two diagonal lines on the rectangle. The two points where the two
diagonal lines intersect with the longitudinal center line of each ingot are the sampling
points of the ingot, as shown in Figure 1.
5.4.1.3 Preparation of test specimens. Collect the drilled powder sample, mix
thoroughly, and then package it. The specimen shall be no less than 100 g and divided
into three bags; each bag shall be no less than 30 g.
5.4.2 Sampling for chemical composition of high-purity tellurium ingot (Te99.9999)
Remove 10%~15% of the head of each ingot and 20%~25% of the tail, take samples at
the head, middle and tail of the middle section, grind them into powder as test
specimens.
5.4.3 Sampling for chemical composition of high-purity tellurium powder and
tellurium granules (Te99.999)
Use a polyvinyl chloride sampler to insert two-thirds of the packaging drum to take the
sample, and place the sample in a sample bag; the sample shall be no less than 300 g,
mixed well and divided into three portions.
5.4.4 Sampling for chemical composition of high-purity tellurium powder and
tellurium granules (Te99.9999)
Insert a polytetrafluoroethylene sampling spoon into two-thirds of the product
packaging bottle to take the sample, and place the sample of no less than 30 g in a
sample bottle; mix well and divide it into corresponding portions according to test needs.
5.5 Determination of test results
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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