低热膨胀磷酸盐陶瓷材料K_xSr_(1-x/2)Zr_4(PO_4)_6的研究

The Research of Low-thermal Expansion Phosphate Ceramic Materials K_xSr_(1-x/2)Zr_4(PO_4)_6

ＫｘＳｒ１－ｘ／２Ｚｒ４（ＰＯ４）６（０≤Ｘ≤２．０）属于 ＮＺＰ族磷酸盐陶瓷材料，它是新的一类低热膨胀陶瓷材料．研究发现ＳｒＺｒ４（ＰＯ４）６（Ｘ＝０）及Ｋ２Ｚｒ４（ＰＯ４）６（Ｘ＝２）时的轴膨胀特性正好相反，因此当Ｘ为某一值时热膨胀系数将为零，控制烧结条件可得到热膨胀系数低及热膨胀异向性小（耐热冲击）的陶瓷材料．本研究采用液相反应法合成了ＫｘＳｒ１－ｘ／２Ｚｒ４（ＰＯ４）６磷酸盐陶瓷材料，当Ｘ＝１、烧结时间为 １．５ ｈ时，热膨胀系数为 ０． ８ × １０－６℃－１，而且具有较小的热膨胀异向性．

KxSr1-x/2Zr4(PO4)6 (0 ≤ X ≤ 2.0) system which belongs to a new large family of low thermal expansion materials known as NZP. It was found that SrZr4(PO4)6 (X=0) and K2Zr4(PO4)6 (X=2) had opposite anisotropies in their respective axial thermal expansion, therefore, the near-zero thermal expansion and small thermal expansion anisotropy phosphate ceramic materials can be obtained by selecting X value and controlling sinter conditions. KxSr1-xnZr4(PO4)6 was synthesized by the liquor reaction method. When X=l and sinter time was l.5 hours, the bulk thermal expansion coefficient was 0.8 × 10-6 ℃-1 and with very small thermal expansion anisotropy.