Forming and sintering of multiphase bioceramics

Abstract

Composite bioceramic materials could find use in a wide range of biomedical applications; however, their processing technologies are quite complex or not sufficiently developed. In order to eliminate deleterious influences of powder inhomogeneities and to reduce the machining time of final components, a novel procedure for multiphase powders using wet pretreatment and direct forming of green bodies having the desired geometries was studied. During the experimental work alumina, yttria-stabilized zirconia, and their mixtures were used. The forming of discs and femoral heads was done by pressure casting of aqueous suspensions of powders. The measurements of physical, mechanical and tribological properties of sintered samples were performed; the results obtained showed the effectiveness of the process since the property values approached those of similar materials actually on the market, while requiring less machining labour.

Bioactive Materials and Processing

“…Some tough but bioinert ceramics such as Ti0 2 , Al 2 0 3 , and zr0 2 can be used to form bioactive ceramic 53 composites for improved mechanical performance (Salomoni et al, 1994;Champion et al, 1996;Silva and Domingues, 1997). Other calcium phosphates such as TCP can also be considered for toughening HA (Slosarczyk and Bialoskorski, 1998).…”

Preparation and properties of binary oxide bioceramics

“…More thorough SEM observations showed in some cases an anomalous grain growth of alumina grains [17]. Among all the materials studied, alumina sample (A) was found to be the most finegrained one.…”

“…The green samples were sintered in air with the following thermal cycle: heating to 800 "C at 1 "C/min and soaking at 800°C for 1 h, heating to 1500°C at 3 "C/min (1550 "C for 228 A) and soaking at the maximum temperature for 2 h and finally cooling to room temperature at 1 "C/min [17]. Tiisopropylate and tetraorthosilicate (TEOS).…”

Processing and characterization of laser-sintered Al2O3/ZrO2/SiO2

“…Furthermore, alumina and silica as biomaterials are widely used in dental applications [5][6][7][8][9]. Many researchers studied the zirconia toughed by alumina [10][11][12][13][14][15][16]. The introduction of zirconia into the Al 2 O 3 -based composition can improve the bioceramic toughness.…”