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[Bonding strength of adhesive resin and calcium phosphate crystalline ceramics (CPCC)]
Abstract:
The bond strengths of two adhesives, Panavia EX (PE) and Superbond C & B (SB), and calcium phosphate crystalline ceramics (CPCC) were examined. Two square pieces of CPCC were joined to each other using PE, and another two pieces were joined using SB at adhesion loads of 0.2kgf and 15.0kgf. The adhered specimens were left at 37 degrees C and 60 degrees C in thermostatically controlled purified water baths for 24 hours. The bond strength was determined by means of an apparatus to measure compressive shear and bond strength. Stress distribution on the interfaces with compressive shear where the adhesive was applied was also studied by a two-dimensional photoelastic experiment. The results were as follows. 1) The test pieces joined with PE at 0.2kgf and left at 37 degrees C provided the maximum bond strength, 69 +/- 16.8kgf/cm2, while those joined at 15.0kgf and left at 60 degrees C provided the minimum bond strength, 10 +/- 5.6kgf/cm2. 2) The test pieces joined with SB at 15.0kgf and left at 60 degrees C and those joined at 0.2kgf and left at 37 degrees C provided the maximum and minimum bond strengths: 179 +/- 36.8kgf/cm2 and 70 +/- 10kgf/cm2, respectively. 3) When the adhesion load was increased from 0.2kgf to 15.0kgf, the coat thickness for PE and SB were decreased from 45 microns (SD = 11.7) to 20 microns (SD = 2.8) and from 68 microns (SD = 24.5) to 18 microns (SD = 2.9), respectively. 4) The bond strengths of PE and SB for CPCC were decreased and increased, respectively, by an increase in adhesion load, i.e., a decrease in the thickness of the coat, and an increase in the temperature of maintenance after adhesion. 6) The photoelastic experiment revealed no differences in stress distribution or shear stress between the combinations of PE and SB adhesives and adherends of SUS304 and CPCC. 7) Shear stress was distributed to the area ranging from the site of load to the base of load on the interfaces with compressive shear where adhesive was applied.