Heat Pipe Reliability Test
Heat pipe technology is a heat transfer element called "heat pipe" invented by G.M. rover of Los Alamos National Laboratory in 1963, which makes full use of the principle of heat conduction and the rapid heat transfer properties of the refrigeration medium, and transfers the heat of the heating object quickly to the heat source through the heat pipe. Its thermal conductivity exceeds that of any known metal. Heat pipe technology has been widely used in aerospace, military and other industries, since it has been introduced into the radiator manufacturing industry, making people change the design idea of the traditional radiator, and get rid of the single heat dissipation mode that simply relies on high air volume motor to obtain better heat dissipation effect. The use of heat pipe technology makes the radiator even if the use of low speed, low air volume motor, can also get satisfactory results, so that the noise problem plagued by air cooling heat has been well solved, opening up a new world in the heat dissipation industry.
Heat pipe reliability test conditions:
High temperature stress screening test: 150℃/24 hours
Temperature cycling test:
120℃(10min)←→-30℃(10min), Ramp: 0.5℃, 10cycles 125℃(60min)←→-40℃(60min), Ramp: 2.75℃, 10cycles
Thermal shock test:
120℃(2min)←→-30℃(2min), 250 cycles
125℃(5min)←→-40℃(5min), 250 cycles
100℃(5min)←→-50℃(5min), 2000 cycles(check once after 200 cycles)
High temperature and high humidity test:
85℃/85%R.H./1000 hours
Accelerated aging test:
110℃/85%RH/264h
Other heat pipe test items:
Salt spray test, strength (blasting) test, leakage rate test, vibration test, random vibration test, mechanical shock test, helium combustion test, performance test, wind tunnel test
High and Low Temperature Test Standard of PC Plastic Material
1. High temperature test
After being placed at 80±2℃ for 4 hours and at normal temperature for 2 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet the normal requirements, and there are no abnormal phenomena such as deformation, warping, and degumming in appearance. The key convex point collapses at high temperature and the press force becomes smaller without assessment.
2. Low temperature test
After being placed at -30±2℃ for 4 hours and at normal temperature for 2 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet normal requirements, and there are no abnormal phenomena such as deformation, warping, and degumming in appearance.
3. Temperature cycle test
Put in 70±2℃ environment for 30 minutes, take out at room temperature for 5 minutes; Leave in -20±2℃ environment for 30 minutes, remove and leave at room temperature for 5 minutes. After such 5 cycles, the dimensions, insulation resistance, voltage resistance, key function, circuit resistance meet the normal requirements, and the appearance of no deformation, warping, degumming and other abnormal phenomena. The key convex point collapses at high temperature and the press force becomes smaller without assessment.
4. Heat resistance
After being placed in an environment with a temperature of 40±2℃ and a relative humidity of 93±2%rh for 48 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet normal requirements, and the appearance is not deformed, warped, or degumped. The key convex point collapses at high temperature and the press force becomes smaller without assessment.
National standard value for plastic testing:
Gb1033-86 Plastic density and relative density test method
Gbl636-79 Test method for apparent density of moulding plastics
GB/ T7155.1-87 Thermoplastic pipe and pipe fittings density determination part: polyethylene pipe and pipe fittings reference density determination
GB/ T7155.2-87 Thermoplastic pipes and fittings -- Determination of density -- Part L: Determination of density of polypropylene pipes and fittings
GB/T1039-92 General rules for testing mechanical properties of plastics
GB/ T14234-93 Surface roughness of plastic parts
Gb8807-88 plastic mirror gloss test method
Test method for tensile properties of GBL3022-9L plastic film
GB/ TL040-92 Test method for tensile properties of plastics
Test method for tensile properties of GB/ T8804.1-88 thermoplastic pipes polyvinyl chloride pipes
GB/ T8804.2-88 Test methods for tensile properties of thermoplastic pipes Polyethylene pipes
Hg2-163-65 plastic low temperature elongation test method
GB/ T5471-85 Method for preparing thermosetting molding specimens
HG/ T2-1122-77 thermoplastic sample preparation method
GB/ T9352-88 thermoplastic compression sample preparation
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