Normy

Obsah

CSN EN ISO 13383-2 This part of EN ISO 13383 specifies a manual method of making measurements for the determination of the volume fraction of major phases in fine ceramics (advanced ceramics, advanced technical ceramics) using micrographs of polished and etched sections, overlaying a square grid of lines, and counting the number of intersections lying over each phase. The method applies to ceramics with one or more distinct secondary phases, such as found in Al2O3/ZrO2, Si/SiC, or Al2O3/SiCw. If the test material contains discrete pores, these are to be treated as a secondary phase for the purpose of this method, provided that there is no evidence of grain pluck-out during polishing being confused with genuine pores. Some users of this part of EN ISO 13383 may wish to apply automatic or semiautomatic image analysis to micrographs or directly captured microstructural images. This is currently outside the scope of this part, but some guidelines are given in Annex A.

Obsah

ČSN EN ISO 23146 This Standard specifies a method for the determination of the fracture toughness of advanced technical ceramics. The procedure makes use of single-edge V-notched bars, which are loaded in four-point bending until failure. It is applicable to monolithic ceramics with a grain size or major microstructural feature size larger than about 1 µm. The use of this Standard for yttria tetragonal zirconia polycrystal material (Y-TZP) is not recommended. The method might also be unsuitable for some other very tough or soft ceramics in which a sharp crack does not form at the root of the V-notch.

Obsah

ČSN EN ISO 26423 This Standard specifies a method for the determination of the thickness of ceramic coatings by a crater-grinding method, which includes the grinding of a spherical cavity and subsequent microscopic examination of the crater. Because of the uncertainty introduced into the measurement of crater dimensions, the test is not suitable for use where the surface roughness of the coating and/or substrate exceeds 20 % of the coating thickness.

Obsah

ČSN EN ISO 26424 This Standard specifies a method for measuring the abrasive wear rate of ceramic coatings by means of a micro-scale abrasion wear test based on the well-known crater-grinding technique used for coating thickness determination in ISO 26423. The method can provide data on both coating and substrate wear rates, either by performing two separate tests or by careful analysis of the data from a single test series. The method can be applied to samples with planar or non-planar surfaces, but the results analysis described in Clause 9 applies only to flat samples. For non-planar samples, a more complicated analysis, possibly requiring the use of numerical methods, is required.

Obsah

CSN EN ISO 14604 This Standard describes a method of measuring the fracture strain of ceramic coatings by means of uniaxial tension or compression tests coupled with acoustic emission to monitor the onset of cracking of the coating. Tensile or compressive strains can also be applied by flexure using four-point bending. Measurements can be made in favourable cases at elevated temperatures as well as at room temperature.

Obsah

ČSN EN ISO 17161 This International Standard describes a procedure - to verify the degree of misalignment of the load train of the test machines using a reference testspecimen uniformly loaded in tension or in compression, and - to give indications in order to correct defects such as torsion and bending. This International Standard is not intended to provide a quantitative and acceptable limit before the testing of ceramic matrix composites with a fibre reinforcement: unidirectional (1D), bidirectional (2D), and tridirectional (xD, with 2 < x

Obsah

ČSN EN ISO 17140 This Standard specifies the conditions for the determination of properties at constantamplitude of load or strain in uniaxial tension/tension or in uniaxial tension/compression cyclic fatigue of ceramic matrix composite materials (CMCs) with fibre reinforcement at room temperature. This Standard applies to all ceramic matrix composites with fibre reinforcement, unidirectional (1D), bi-directional (2D), and tri-directional (xD, where 2 < x

Obsah

CSN EN ISO 17142 This Standard specifies the conditions for the determination of properties at constantamplitude of load or strain in uniaxial tension/tension or in uniaxial tension/compression cyclic fatigue of ceramic matrix composite materials (CMCs) with fibre reinforcement for temperature up to 1 700 °C in air at atmospheric pressure. This Standard applies to all ceramic matrix composites with fibre reinforcement, unidirectional (1D), bi-directional (2D), and tri-directional (xD, where 2 < x

Obsah

ČSN EN 16703 Tato evropská norma specifikuje doplňkové informace k EN ISO 10140-1, které jsou nezbytné, jak za standardních podmínek efektivně provádět a určovat neprůzvučnost systémů montovaných stěn ze sádrokartonu s ocelovými profily podle EN ISO 10140-2 "Akustika - Laboratorní měření zvukové izolace stavebních konstrukcí - Část 2: Měření vzduchové neprůzvučnosti". Je zřejmé, že všechny požadavky EN ISO 10140-2 mají být také splněny. Pro snížení nejistoty se specifikují: - další pokyny pro zkoušení systémů montovaných stěn ze sádrokartonu s ocelovými profily; a - metoda pro ověření laboratoře pomocí dvou referenčních zkušebních příček.

Obsah

ČSN EN 12050-4 ed. 2 Tato norma se používá pro zpětné armatury čerpacích stanic na vnitřní kanalizaci pro odpadní vody s fekáliemi a bez fekálií. Tato norma stanovuje obecné požadavky, konstrukční zásady a zkoušení, jakož i údaje o materiálech a posuzování a ověřování stálosti vlastností.

Obsah

ČSN EN 16772 This European Standard provides guidance on methods for sampling invertebrates in the hyporheic zone of wadable rivers. It describes each method, including details of the equipment involved and its use in the field. Guidance is given on developing a sampling strategy and selecting an appropriate survey technique for the purpose of investigation.

Obsah

ČSN EN ISO 14408 ed. 2 This International Standard specifies marking, labelling, and information to be supplied by the manufacturer for cuffed and uncuffed tracheal tubes and related materials designed to resist ignition by a laser