Elastic Modulus, Vickers Hardness and Fracture Toughness of MO·2B<SUB>2</SUB>O<SUB>3</SUB> (M=Ca, Sr, Ba) and M<SUB>2</SUB>O·2B<SUB>2</SUB>O<SUB>3</SUB> (M=Li, Na, K) Glasses

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  • MO·2B<SUB>2</SUB>O<SUB>3</SUB> (M=Ca, Sr, Ba)およびM<SUB>2</SUB>O·2B<SUB>2</SUB>O<SUB>3</SUB> (M=Li, Na, K)系ガラスの弾性率，硬度および破壊靭性
  • MO・2B2O3(M=Ca,Sr,Ba)およびM2O・2B2O3(M=Li,Na,K)系ガラスの弾性率,硬度および破壊靭性
  • MO 2B2O3 M Ca Sr Ba オヨビ M2O 2B2O3 M Li
  • Elastic Modulus, Vickers Hardness and Fracture Toughness of MO&middot;2B<SUB>2</SUB>O<SUB>3</SUB> (M=Ca, Sr, Ba) and M<SUB>2</SUB>O&middot;2B<SUB>2</SUB>O<SUB>3</SUB> (M=Li, Na, K) Glasses

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Elastic moduli, Vickers hardness and fracture toughness of borate glasses containing 33.3 mol% of alkaline metal oxides or alkaline earth metal oxides were studied. Elastic moduli (bulk modulus K, Young’s modulus E, shear modulus G and Poisson’s ratio ν) were related with mean atomic volume V as follows; K=k1Vf, E=k2Vg, G=k3Vh, 1+ν=k4Vj, where f=−1.30 and −1.59, g=−1.64 and −2.13, h=−1.68 and −2.24, and j=0.11 and 0.04 for alkaline metal and alkaline earth metal borate glasses, respectively. The f value obtained from relationship between bulk modulus and mean atomic volume was close to a theoretical value (f=−4⁄3). Vickers hardness HV was correlated with ion-oxygen attraction I. There was a linear relationship between fracture toughness KIC and young’s modulus E.

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